Area in square meters = pi*42
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314 ft2
A circle with a radius of 10 meters has an area of 314 square meters.
pi x square of radius gives area. 3.14 x 100 = 314 sqft.
314 sqmm
Area of circle is pi r^2, in this case approx 314 sq cm (3.14 x 10 x 10). For your semi-circle, half of this ie 157 sq cm