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How do you find the area of a circle given the radius of a circle?

Wiki User

2012-05-15 23:39:14

A = pi r^2

Commit this to memory; it is very elementary maths.

Where

'A' is the Area and 'r' is the radius.

In words 'Area ( of a circle) is equal to 'pi' multiplied to the radius squared'.

Similarly for the circumference of a circle.

C = 2pir or C = pi*d

Where 'C' is the circumference of the circle, 'r' is the radius or 'd' is the diameter.

NNB 'pi' ~ 3.14 for elementary school purposes. This is only an approximation for 'pi' as it is an irrational number ; the decimals are in no particular order and go to infinity. Closer approximations are 3.1416 , or 3.141592654....

lenpollock

Lvl 13
2023-02-23 10:45:45
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Wiki User

2012-05-15 23:39:14

Find the circumference of a circle with radius 5 ft.

Area of a circle. The area of a circle of radius r is given by the polynomial πr2. Use 3.14 as an approximation for π.

Anonymous

Lvl 1
2020-06-04 14:04:12

28 in long need to know how big to make a circle