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Examples of Area of a circle

Area of a circle

Post by natttt
Posted on 2011-01-24 20:07:39
A circle with radius r units has an area of A square units given by the formula:

A = pi * r^2, where pi is aproximately 22/7

Example: Find the area of a circle whose diameter is 17 cm.

d = 17 cm
r = 1/2 d = 1/2 * 17 = 8,5 cm

A = pi * r^2
A = 22/7 * 8,5^2
A = 227,07 cm^2

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