Area of circle: pi*10^2 = 314.159 square units to 3 decimal places
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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
A circle with a radius of 10 meters has an area of 314 square meters.
10 :)