### Inputs:

Diameteror
Circumference:
Unit:inchesfeetyardsmileskilometersmeterscentimetersmillimeters
Calculate Area

### Area the a circle in regards to radius:

Area= π·r2= 3.14·102= 314.2 square inches(*)

### Area the a circle in regards to diameter:

Area= π·(d2)2= 3.14·(202)2= 3.14·(10)2= 314.2 square inches(*)

### Area the a circle in terms of circumference:

Area= C24π= 62.8324π= 3947.61(4·3.14)= 3947.6112.56= 314.2 square inches(*)

(*) 314.15926535898 inches, precisely or minimal to the precision that this calculator (13 decimal places).

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Note: because that simplicity, the operations above were rounded come 2 decimal places and π to be rounded to 3.14.

### A one of radius = 10 or diameter = 20 or one = 62.83 inches has actually an area of:

2.02709E-7 square kilometers (km²)0.202709 square meters (m²)2027.09 square centimeters (cm²)202709 square millimeters (mm²)7.82665 × 10-8 square miles (mi²)0.242438 square yards (yd²)2.18194 square feet (ft²)314.2 square inches (in²)

Use the this one area calculator listed below to discover the area that a circle offered its radius, or various other parameters. To calculation the area, you simply need to get in a confident numeric value in one of the 3 areas of the calculator. Girlfriend can also see in ~ the bottom of the calculator, the step-by-step solution.

## Formula because that area the a circle

Here a three means to uncover the area the a circle (formulas):

A = πr2

A = π(d2)2

### Circle area formula in regards to circumference

A = C24π

See below some definitions related come the formulas:

### Circumference

Circumference is the direct distance around the circle edge.

The radius that a one is any type of of the heat segments indigenous its facility to that is perimeter. The radius is fifty percent the diameter or r = d2.

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### Diameter

The diameter of a one is any type of straight heat segment the passes v the facility of the circle and whose endpoints lied on the circle. The diameter is double the radius or d = 2·r.

### Note:

If friend input the radius in centimeters, girlfriend will get the prize in square centimeters (cm²), if in inches, will get the answer in square customs (in²) and also so ~ above ...