pie times the radius squared should help you
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A circle with a radius of 10 meters has an area of 314 square meters.
A circle with a radius of 7.75 meters has an area of 188.69 square meters.
A circle with a radius of 5455 meters has an area of 93,484,451.13 square meters.
radius = square root of 100pi/pi = 10 meters
A circle with a radius of 30 meters has an area of 2827.43 square meters.