A circle with a radius of 10 metres has an area of 314.16 square metres.
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Area of any circle = pi*radius squared
Radius 10, area = 100 pi; radius 9, area = 81 pi
A circle with a radius of 10 meters has an area of 314 square meters.
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Radius = 20/2 = 10 Area of circle = pi x radius x radius = 3.1415 x 10 x 10 = 3.1415 x 100 = 314.15 square units