314.29 cm
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A circle with a radius of 10 metres has an area of 314.16 square metres.
Area of any circle = pi*radius squared
Radius 10, area = 100 pi; radius 9, area = 81 pi
Pi x Radius x Radius = Area 3.1415 x 10 x 10 = 314.15 in^2 (for more accuracy, find more exact values of Pi)
A circle with a radius of 10 meters has an area of 314 square meters.