An area of a circle is pi*r2 - so an area of a semicircle is 0.5*pi*r2:
0.5*3.14*42 = 25.13 square meters
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A circle with a radius of 3 meters has an area of 28.27 square meters.
A circle with a radius of 2.5 meters has an area of 19.63 square meters.
The radius is 7 meters.
Radius is approximately 10.093 meters.
A circle with a radius of 10 meters has an area of 314 square meters.