The area A of a circle whose diameter is D and radius r is given as
A = Pi D^2/4 = Pi r^2
Where Pi is 3.142 or 22/7
Hence given that the diameter of the crop circle is 30 feet
The area A
= 3.14 * 30^2/4
= 3.14 * 225
= 706.5 square feet
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