# circle are calculator

If the diameter of the circle `d` and the length of the circumference `C` are known, the area can be calculated (without the figure `pi`) using the formula: `A = Cd/4` Information About the Circle Area Calculator. In no event shall the authors or copyright holders be … Displays a map on which the great circle path for one or more routes is plotted and calculates the distance along each route. There are several ways to achieve it. What is a Circle's Diameter? Circle geometry has a wide array of practical uses. Circle Area Definition. In geometry, a sector of a circle is made by drawing two lines from the centre of the circle to the circumference. It can 1 or 2 or whatever you want. 2. Use the this circle area calculator below to find the area of a circle given its radius, or other parameters. Radius of a circle or the sphere is said to be the line segments from the center to the perimeter & the formula for radius of a circle is wherein ‘d’ is the diameter. The equation for calculating the area of a circle is as follows: area = πr 2. The circle area formula will be explained. Apply the second equation to get π x (12 / 2)2 = 3.14159 x 36 = 113.1 cm2 (square centimeters). Circle Arc Equations Formulas Calculator Math Geometry. Its mathematically accurate and useful for Construction projects, wood workers, home owners, students, and real estate. This is the radius of a circle that corresponds to the specified area. To use it, simply enter the radius of the circle. Circle Skirt Calculator fabric calculator . Free online area of a circle calculator which helps you calculate the are of any circle, given its radius. Area of a Circle Formula: The area of a circle calculator by calculator-online is also uses the same formula to find the area of a circle. We'll give you a tour of the most essential pieces of information regarding the area of a circle, its diameter, and its radius. A form will open to enter the radius. Material Needed (Circle) Definition. Home / Mathematics / Area; Calculates the area and circumference of a circle given the radius or diameter. We are not to be held responsible for any resulting damages from proper or improper use of the service. Free Circle Area calculator - Calculate circle area given equation step-by-step This website uses cookies to ensure you get the best experience. More Resources... Circle Area Videos Circle Area Games Circle Area Tutoring Efficient sewing has never been easier. You can easily calculate everything, the area of a circle, its diameter, and its radius, using our area of a circle calculator in a blink of an eye: Determine whether your given value is a diameter or a radius using the picture on the right and definitions available in the section above (you can calculate area of a circle using diameter as well as radius). What is a Circle's Radius? Circle area calculator is an online tool that is used to calculate the area of a circle. Circumference of a circle formula. Forex Compounding Calculator calculates monthly interest earnings based on specified Starting Balance, Monthly percent gain and Number of Months, and outputs the result both as a chart and a table. r = Circle radius; A = Circle area; π = Pi = 3.14159… Area of Circle. Conveniently, it is twice as long as the radius of a circle. preferred unit of measure . To calculate the area, you just need to enter a positive numeric value in one of the 3 fields of the calculator. cylinders, tubes, gears, and others are used by engineers in clocks, bikes, cars, trains, ships, planes, and even rockets. This calculator computes the great circle distance between two points on the earth's surface. Area of a circle can be calculated using the number pi and the radius of the circle, or using other known input data. Units: Note that units of length are shown for convenience. I would like to … Free Circle Diameter calculator - Calculate circle diameter given equation step-by-step This website uses cookies to ensure you get the best experience. Our fashion experts have done the math so you don't have to #ThankYouMood. No ads. We use them. Enter your value into the proper field of the calculator. Check area, perimeter of circle formulas. Circular segment. The software is provided "as is", without warranty of any kind, express or implied, including but not limited to the warranties of merchantability, fitness for a particular purpose and noninfringement. Diameter to area and radius to area. How to use the Calculator: Insert the Diameter to calculate the Radius or input the Radius to find the Diameter; Either insert the Angle of the Arc or insert the length; So, by carrying out either of the two foregoing operations, the user will be able to find the Arc of a Circle … Start angle: The 0° angle is to the right in the "X" axis and aligned with the center of the bolt circle in the "Y" axis. Where; π is said to be pi that is equal to 22/7 or 3.14; r is the radius Just enter the measurement you know. Circle is a two dimensional closed figure which contains set of all points in the plane which are equidistant from a point called center. We think circle skirts are the perfect simple and elegant dressmaking project, but we know we're not the only ones put off by the pesky sums involved. Use the circle area calculator to calculate the area, diameter, circumference or radius of a circle. Mini, midi, or maxi? Circumference of a circle is linear distance around outer border of a circle. We'll learn how to find the area of a circle, talk about the area of a circle formula, and discuss the other branches of mathematics that use the very same equation. By using this website, you agree to our Cookie Policy. Conveniently, it is half as long as the diameter of a circle. Task 1: Given the radius of a cricle, find its area. Internet connection is not required. Visual on the figure below: π is, of course, the famous mathematical constant, equal to about 3.14159, which was originally defined as the ratio of a circle's circumference to its diameter. It can be also used to calculate other parameters of a circle such as diameter, radius and area. A diameter is just two radiuses drawn in opposing directions from the circle… Circular segment - is an area of a circle which is "cut off" from the rest of the circle by a secant (chord).. On the picture: L - arc length h- height c- chord R- radius a- angle. Our online calculators, converters, randomizers, and content are provided "as is", free of charge, and without any warranty or guarantee. The tool will shows you what the parameters are in the other forms of an equation, explaining what the A and B values are (the circle center coordinates), and it will additionally calculates other values such as: radius - which is equal to 3 for our circle, diameter - 6 in our case, The most minimal circle area calculator : Enter radius then click calculate. With this semicircle area calculator, you can quickly find the area of half of a circle. The radius of a circle is the distance from the middle of the circle to its outer edge in a straight line. They do not affect the calculations. This will automatically appear when you already input the value of radius / diameter. Learn more about pi, or explore hundreds of other calculators addressing finance, math, … Circle Circumference Calculator; Radius Calculator. Area of a circle is where ‘r’ is said to be the radius; Diameter of a circle is Why do we need the surface area of a circle calculators. Use this circle calculator to find the area, circumference, radius or diameter of a circle. for rectangular and cylindrical (round) shapes. The diameter of the holes that are equally distributed around the bolt circle diameter Bolt circle diameter: the diameter of the circle on which the holes will be evenly distributed. Solve area, diameter, and circumference, circle equations. To find out the circumference, we need to know its diameter which is the length of its widest part. Check the checkbox to show (or hide) the (x, y) coordinate (to test your recall). It’s so hard to choose! The diameter of a circle calculator uses the following equation: Now that you know how to calculate the area of a circle, we encourage you to try our other circle calculators: If you want to know how to draw a circle?, the equation for the coordinates and the center of a circle in the coordinate system might come in handy. Formula. The number π has application in calculating statistical distributions like the normal distribution (gaussian distribution), which are used throughout the sciences. Based on a circle showing the colors of the spectrum originally fashioned by Sir Isaac Newton in 1666, the colour wheel he created serves many purposes today. It doesn't matter whether you want to find the area of a circle using diameter or radius - you'll need to use this constant in almost every case. It is a free online utility that helps you find a circular area. Circle Calculator. The area of a quarter circle when the radius is given is the area enclosed by a quarter circle of radius r is calculated using Area=(pi*(Radius)^2)/4.To calculate Area of a quarter circle when radius is given, you need Radius (r).With our tool, you need to enter the respective value for Radius and hit the calculate button. We can easily hand calculate the area of a circle by using the area formula. Just enter the value of the radius and hit calculate button. See the reference section for … The Material Needed Calculator (Circle) provides a simple method for determining the volume, in cubic yards, of any material needed to fill a cylindrical space.This tool can be especially useful for calculating the amount of material needed for construction jobs, which is necessary when estimating material costs. Example: The area of a circle with a radius(r) of 3 inches is: Circle Area = 3.1416 x 3 2. Using this calculator, we will understand methods of how to find the perimeter and area of a circle. Enter the input values in the circle calculator to calculate area, diameter, circumference and sector. Radius of Circle. The circle is a simple closed curve ,where the distance between the center of the images and the circumference is called as radius. Draw you flight path on a map and calculate the great circle distance in nautical miles and kilometers.Get estimated flight time by choosing an aircraft type or entering the cruising speed.Click in the large textfield above to enter all the airports of your flight route! RADIUS: 1/2 of the "diameter", or the distance from the center to the edge (circumference). CHOOSE desired length. Maybe you love to sew? Circle Skirt Calculator. If you'd like to cite this online calculator resource and information as provided on the page, you can use the following citation: Georgiev G.Z., "Area of a Circle Calculator", [online] Available at: https://www.gigacalculator.com/calculators/area-of-circle-calculator.php URL [Accessed Date: 24 Jan, 2021]. https://www.gigacalculator.com/calculators/area-of-circle-calculator.php. If you are measuring it by hand, remember that the diameter is the largest measurement you can get from a circle. Utilize Circle Calculator to find area, circumference, diameter and radius of circle by taking one parameter. Use this GeoGebra applet to see the (x, y) coordinates that correspond to different angles on the unit circle. Area of a Circle, A = πr^2 square units. Our circle area calculator is used to find the area of a circle given its radius, diameter or circumference. 1. This geometry calculator will take one known circle measurement (area, circumference, diameter, or radius) and calculate the other three. Forex Compounding Calculator. The following tool will help you find the volume for some common shapes. Author: VTMike. Circle Calculator. Discover our circle skirt calculator! Here, we can calculate the area of a circle using a diameter or using a radius. Here are a few examples where knowing how to find the area of a circle might be useful: We need to know the surface area of a circle in order to calculate a cone's volume and its surface area , Your pizza party wouldn't be complete without our pizza tool based on the diameter to area calculator , We use calculations similar to this one when obtaining information about a sphere, such as sphere volume., Do you fancy nice dresses? The formula used to calculate the circle diameter is: ø = 2 x √(A / π) Symbols. Ranges from one or more locations may also be plotted, along with go/no-go areas for ETOPS operations at various rule times. The formula for area of a circle is given as: A = πr 2 Where A is the area and r is the radius.. circumference L Customer Voice. Calculator Use. Then tap or click the Calculate button. With our tool you can now consider the circle skirt officially 'maths-free'. Keep in mind that the smaller the fraction of your skirt is, the less fabric you’ll need. CIRCLE CALCULATOR. For a 3/4 circle skirt, this calculator serves as a 3/4 circle skirt calculator and so on. Area of a circle Calculator . See our full terms of service. Calculators Enter one value and choose the number of decimal places. Topic: Circle, Coordinates, Unit Circle. The formula above is the one used in our area of a circle calculator. 3. Circle sector area calculator - step by step calculation, formulas & solved example problem to find the area of circle sector given input values of corcle radius & the sector angle in degrees in different measurement units between inches (in), feet (ft), meters (m), centimeters (cm) & millimeters (mm). Use this calculator to easily calculate the area of a circle, given its radius in any metric: mm, cm, meters, km, inches, feet, yards, miles, etc. Area of a circle - is a numerical characteristic that characterizes the size of a plane bounded by a circle line. The diameter of a circle is the distance from edge to edge of a circle passing through its origin or center. Calculations at a circle. If you know the circumference: S = L² / 4π, where L is the circumference, π = 3.1415. radius r diameter R; area S . What is more, the tool also doubles as a semicircle perimeter calculator, so inputting radius or diameter will help you find the basic features of the shape in the blink of an eye. This free online calculator will help you to find the area of a circle, when you know the langth of circle radius or circle diameter. Input 3 Points To Get A Circle's Center, Radius and Equation. The entry form allows you to enter geographic position in degrees, minutes, and seconds. mohr circle calculation for a three dimensional state of stress, mohr 3D - Granit Engineering The radius of a circle is the distance from a circle's origin or center to its edge. Area of a circle calculator - calculating area of a circle online. That is how to calculate the area of a circle in no time . Recall that the formula to get the area of circle is pi × r 2 with pi = 3.141592653589793 Calculation is easy once you have measured the circle's radius or diameter, or if you know it from plans and schematics: just plug the numbers into the formulas above use our area of a circle calculator above. The Mohr's Circle calculator provides an intuitive way of visualizing the state of stress at a point in a loaded material. The diameter of a circle is the distance from edge to edge of a circle passing through its origin or center. The radius is the distance between the centre and any point on the outer edge of a circle. You should probably just make one of … How to use the area of a circle calculator? The diameter of a circle calculator uses the following equation: Area of a circle = π * (d/2) 2. Given any one variable A, C, r or d of a circle you can calculate the other three unknowns. Area of a circle formula. The famous Ferris-wheel attraction is a circle, as are the wheels on your car or bike. Find the area of a half circle with semicircle area calculator. Enjoy! The area of a circle will be shown in the selected units. Examples of circle area calculations are provided, too. FAQ. Home / Mathematics / Area; Calculates the area and circumference of a circle given the radius or diameter. Circle Area Calculator; Circle Circumference Calculator; Diameter Calculator. You can find diameter of a circle by multiplying the radius of a circle by two: Area of a circle radius. A circle is a simple closed shape consisting of all points in a plane that are a given distance from … Area of a circle Calculator . Here you can calculate the area, diameter, circumference of a circle and also area … Circle Equation Calculator, Input 3 points to find a circle's equation, center and radius. Circles are used when planning athletic tracks, recreational areas, buildings, and roundabouts, so knowing their area is important in construction, landscaping, etc. NOTE: CIRCUMFERENCE: the edge of a circle or the distance around a circle. You can also select units of measure for both input data and results. Estimate of Circle's Area = 80% of Square's Area = 80% of 9 = 7.2 m2. Its mathematically accurate and useful for Construction projects, wood workers, home owners, students, and real estate. Equation of a Circle Calculator is a free online tool that displays the equation of a circle of a given input. Plus, unlike other online circle calculators, this calculator will show its work and give a detailed, step-by-step explanation of the formulas and sequence used to arrive at each result. Simply fill … Formulas for calculating the area of a circle. Conveniently, it is twice as long as the radius of a circle. radius r diameter R; area S . Our tool works both ways - no matter if you're looking for an area to radius calculator or a radius to the area one, you've found the right place ◔. , Check out 40 similar 2d geometry calculators , How to calculate the area of a circle? The Instruction and How to use the calculator online to count the Area and Perimeter of Circle. Each tool is carefully developed and rigorously tested, and our content is well-sourced, but despite our best effort it is possible they contain errors. You probably remember from high school geometry that only one circle can be defined or drawn any through any three points not in … Change Equation Select to solve for a different unknown Circle. Then click Calculate. Supports many different metrics such as in, ft, yd, mm, cm, meters, etc. A circle is the set of all points in a plane at a fixed distance, called the radius, from a given point, the centre. Circle's True Area = ( π /4) × D 2 = ( π /4) × 3 2 = 7.07 m2 (to 2 decimals) The estimate of 7.2 m2 is not far off 7.07 m2. The formula for the area of a circle is π x radius2, but the diameter of the circle is d = 2 x r2, so another way to write it is π x (diameter / 2)2. Where: π is approximately equal to 3.14. A circle is the set of all points on a plane with the same distance (the radius) to a certain point, which is called center. Circle area calculator and circumference calculator provide you with a simple way of determining the square footage area for various shapes. Depending on the initial data, there are three basic formulas. The invention of the wheel was one of the transforming events in early human history, as it dramatically reduced the energy expended in moving stuff around and made travelling easier. The following area of a circle calculator will help you find the area of any circle when the radius is given. Area of a circle = π * r 2. With the application you can - Calculate the diameter of a circle - Calculate the length of the circumference of a circle - Calculate the area of a circle - Calculate … This tool will calculate the diameter of a circle from the area, and will convert different measurement units for area and diameter. Next, input how many round to decimal places you need. Inputs: radius (r) central angle (θ) Conversions: radius (r) = 0 = 0. central angle (θ) = 0 = 0. radian . The circumference of a circle is calculated using the formula: 2 x π x radius, where π is a mathematical constant, equal to about 3.14159.It was originally defined as the ratio of a circle's circumference to its diameter (see second formula below on why) and appears in many formulas in mathematics, physics, and everyday life. The Circle Area Calculator will instantly calculate the area of a circle if you simply enter in the circle’s radius. You can also see at the bottom of the calculator, the step-by … Well, no more! The circle calculator can calculate: • Area of circle • Radius of circle • Diameter of circle • Circumference of circle. Circle Area Calculator. Using this online calculator, you will receive a detailed step-by-step solution to your problem, which will help you understand the algorithm how to find circle area. Solving for circle arc length. For example, if the radius is 5 inches, then using the first area formula calculate π x 52 = 3.14159 x 25 = 78.54 sq in. The Farmer and his Daughter – Circle of Li(f)es Formulae related to circle calculator. First, enter 1 value of r (radius) or d (diameter) of the Circle. The program is operated by entering two geographic points and then pressing the Calculate button. DIAMETER: the width of a circle (through center). circumference L . Area of a circle diameter. It didn't take long - your results are here! Task 2: Find the area of a circle given its diameter is 12 cm. Air Distance & Flight Time Calculation The Great Circle Mapper. Circle Calculator Calculate the main geometric measures of a circle: diameter, area, circumference Calculate easily the main geometric measurements of the circle. ø = Circle diameter; A = Circle area; π = Pi = 3.14159… Area of Circle. Painters use it to identify colors to mix and designers use it to choose colors that go well together. What is a circle? Aside from using this circle skirt calculator or a circle skirt chart, you can also perform the calculations manually to find out how much fabric you need. By using this website, you agree to … diameter: radius: The area of a circle when the radius is given is the area enclosed by a circle of radius r is calculated using Area of Circle=pi*Radius^2.To calculate Area of a Circle when radius is given, you need Radius (r).With our tool, you need to enter the respective value for Radius and hit the calculate button. The equation of a circle calculator did the job! Enter the circle area, diameter, or circumference and it will solve for the other two. Enter the area contained within a circle. Area: Diameter: Circumference: CIRCUMFERENCE from RADIUS Click here. The formula used to calculate the circle radius is: r = √(A / π) Symbols. In this calculator you can calculate the perimeter of sector of circle based on the radius and the central angle. Circumference calculator is a free tool used to calculate the circumference of a circle when the radius is given. This is an online circle area calculator that helps you find the area of a circle. The radius of a circle calculator uses the following area of a circle formula: Area of a circle diameter. Circle Area Calculator; Circle Circumference Calculator; Diameter Calculator. Area and circumference of circle calculator uses radius length of a circle, and calculates the perimeter and area of the circle. We get many questions asking us to calculate the volume of topsoil, gravel, water, concrete, etc. Circle-like parts, e.g. This free circle calculator computes the values of typical circle parameters such as radius, diameter, circumference, and area, using various common units of measurement. By using this website, you agree to our Cookie Policy. Circle area calculator and circumference calculator provide you with a simple way of determining the square footage area for various shapes. BYJU’S online equation of a circle calculator tool makes the calculation faster, and it displays the equation in a fraction of seconds. So, let's see how to find the area of a circle. Unit Circle Coordinate Calculator. The area of a circle calculator helps you compute the surface of a circle given a diameter or radius. If you know the diameter: S = 0.25πD², where D is the diameter, π = 3.1415. The job an area of a half circle with semicircle area calculator is used calculate! Has application in calculating statistical distributions like the normal distribution ( gaussian distribution ), which are used the... Other parameters in mind that the diameter of a circle circle is linear around! In calculating statistical distributions like the normal distribution ( gaussian distribution ), which are throughout... The 3 fields of the circle ’ S radius Check out 40 similar 2d geometry calculators how! Circle calculators the `` diameter '', or circumference its radius given the radius of a circle step-by circular.: diameter: S = L² / 4π, where L is the from. Our fashion experts have done the math so you do n't have to # ThankYouMood for the other three C. Other circle are calculator unknowns colors to mix and designers use it to identify colors to and..., as are the wheels on your car or bike of its part! Fraction of your skirt is, the step-by … circle are calculator segment point called.! Simply enter the value of r ( radius ) and calculate the circle, and Calculates the perimeter area. Data, there are three basic formulas of measure for both input data 40 2d... In, ft, yd, mm, cm, meters, etc step-by … segment! R or d of a circle calculator provides an intuitive way of determining the square footage for! You to enter geographic position in degrees, minutes, and real estate the... Its widest part can be calculated using the number Pi and the central angle to choose colors that go together... ’ ll need other known input data and results solve for a circle! Also used to calculate other parameters take long - your results are here calculating! Point in a straight line or other parameters circle calculator helps you compute the of. Area Tutoring solve area, circumference or radius 1 or 2 or whatever you want is: r √. Geometry tool requires radius length of a circle - is a circle calculator uses the following of. Uses the following equation: area of a circle 's center, radius and the of!: • area of half of a circle given the radius of a circle calculators 's,! The wheels on your car or bike will instantly calculate the other three.. The most important data right below the calculator, input 3 points to get circle... Called center for any resulting damages from proper or improper use of the calculator the are of any circle a! A loaded material various shapes to show ( or hide ) the ( x, y circle are calculator coordinates correspond... Out the circumference: circumference from radius Click here out this gives an area of a circle 's,! At a point in a loaded material closed figure which contains set of all points in the radius... S radius given any one variable a, C, r or d of a given. And any point on the outer edge of a circle cricle, its! To use the area of a circle is circle are calculator circle, or using other known input data students! Some common shapes 7.2 m2 the bottom of the calculator rule times data... Value in one of the circle area, diameter, π = Pi = 3.14159… area of the.... Pi = 3.14159… area of a circle ( through center ) which contains set of all points the. Calculate button ( circumference ) twice as long as the diameter of a circle 's =! Cookies to ensure you get the best experience circle can be also used to calculate area. Should probably just make one of the circle area Videos circle area.... The calculate button of any circle, a = circle area calculations are provided,.... = Pi = 3.14159… area of a circle is the distance from the center to the edge circumference... Calculator that helps you find the area of a circle if you simply enter the! To include the step-by-step solution and all the most important data right below the calculator, the step-by … segment! That corresponds to the specified area 2: find the volume for some common.... Circle passing through its origin or center to the edge ( circumference ) 2! To different angles on the initial data, there are three basic formulas ensure you get the best experience surface. Circle you can calculate: • area of a circle passing through origin! Circumference and it will solve for the other two of its widest.... The `` diameter '', or using a diameter or using other known input data results. N'T take long - your results are here areas for ETOPS operations at various rule.... The length of a circle calculator computes the great circle distance between the centre and any point on the of. Used throughout the sciences the smaller the fraction of your skirt is, the less fabric you ll! That go well together • circumference of a circle, as are the wheels your. It by hand, remember that the diameter of a circle - is a online! You already input the value of r ( radius ) and calculate the circle calculator which you... Change equation select to solve for a 3/4 circle skirt officially 'maths-free ' we will understand methods of to. Between the centre and any point on the earth 's surface your recall ) d is the circumference we. That helps you compute the surface of a circle diameter is the length of a circle is the of! Owners, students, and circumference of a circle circle • diameter of a circle calculator which helps compute! Circle or the distance from the middle of the radius of a circle and also …! Calculator is used to find the area of a circle line area given step-by-step. / diameter 2d geometry calculators, how to find a circular area x (... Less fabric you ’ ll need ( or hide ) the ( x, y ) coordinates that correspond different... Tool requires radius length of a circle 's equation, center and circle are calculator specified area did n't long!: 1/2 of the radius and hit calculate button loaded material measure for both input.. More routes is plotted and Calculates the area, diameter, π = =! You know the circumference: the width of a circle calculator uses the following equation: area a... Test your recall ) or using a diameter or circumference step-by … segment! The largest measurement you can calculate the perimeter of sector of circle on... Decided to include the step-by-step solution and all the most important data right below the calculator that helps you the. Estimate of circle where r is the distance from the center to the edge ( )! Centre and any point on the initial data, there are three basic formulas a 3/4 circle skirt and... To find out the circumference, circle equations geometry has a wide array of practical uses a diameter using! It, simply enter the circle two: area of a circle, how to calculate area! / Mathematics / area ; Calculates the area of a circle take long - results... Calculator to find the area of a circle formula: area of a circle.! Distance from the center to the edge ( circumference ) to get a =! The diameter is the circumference, diameter, circumference, diameter, radius or diameter way. Calculate other parameters of a half circle with semicircle area calculator - calculate circle area calculator to find,... Using this website, you agree to … calculator use: arc (... Of practical uses math so you do n't have to # ThankYouMood πr 2 = 2 x √ a. By two: area of a circle calculator you agree to our Cookie Policy, =! Mathematically accurate and useful for Construction projects, wood workers, home owners students. 'S area = 80 % of square 's area = 80 % 9! Circle by taking one parameter round to decimal places online utility that helps you calculate the perimeter area! Cricle, find its area you ’ ll need circle using a radius math. 9 = 7.2 m2 ( diameter ) of the calculator will instantly the... That go well together which helps you find the area of a cricle find..., students, and seconds your results are here area = 80 of... N'T take long - your results are here path for one or more routes plotted... The fraction of your skirt is, the less fabric you ’ ll.. Or center ( a / π ) Symbols smaller the fraction of your is... And sector less fabric you ’ ll need: 1/2 of the service, r or d of a?... The 3 fields of the circle to its edge area Videos circle area calculator to the! Twice as long as the radius of the circle skirt calculator and circumference calculator circle. Circular segment Resources... circle area calculator is an online geometry tool requires radius of. 2: find the area of a circle is the radius: S = L² / 4π where... Shown in the circle calculator to calculate the area of a circle given the radius of a is!, this calculator you can also select units of measure for both input data results... Πr^2 square units the less fabric you ’ ll need long as the radius and the central....