Area = pi*202 = 1256.637 square m to 3 dp
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radius = 20/2*pi = 3.183098862 m
3850m is the area of the a circle whose radius of 7meaters
The area of a circle, if the radius is 5 cm, is: 78.54 cm2
A circle with a radius of 13 units has an area of 530.93 square units.
A circle with a radius of 11m has an area of ~380.13 m2