You are watching: Find the area of the circle. leave your answer in terms of π.

Solutions\< \textbfdiameter \, d = 2r \>\

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## Circle Shape

r = radius d = diameter C = one A = area π = pi = 3.1415926535898 √ = square root

## Calculator Use

Use this circle calculator to uncover the area, circumference, radius or diameter of a circle. Given any one change A, C, r or d the a circle you have the right to calculate the various other three unknowns.

**Units:** note that units of length are shown for convenience. They perform not impact the calculations. The units room in location to offer an indication of the order of the outcomes such as ft, ft2 or ft3. Any other basic unit can be substituted.

## Circle recipe in terms of Pi π, radius r, and also diameter d

### Radius and also Diameter:

r = d/2 d = 2r

### Area that a circle:

A = πr2 = πd2/4

### Circumference the a circle:

C = 2πr = πd

## Circle Calculations:

Using the formulas over and added formulas you can calculate nature of a given circle for any given variable.

**Calculate A, C and also d | provided r** offered the radius that a circle calculation the area, circumference and also diameter. Placing A, C and also d in regards to r the equations are:

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**Calculate r, C and also d | given A** provided the area of a circle calculation the radius, circumference and diameter. Placing r, C and d in regards to A the equations are:

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\< d = 2r = 2 \sqrt\fracA\pi \>

**Calculate A, r and also d | given C** given the one of a circle calculation the radius, area and diameter. Placing A, r and d in terms of C the equations are:

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**Calculate A, C and r | provided d** provided the diameter that a circle calculation the radius, area and circumference. Placing A, C and also r in terms of d the equations are: