There is no need to square the answer. The circumference of any circle is 2 radius pi or 2rπ.
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Circumference of circle: 31.4 inchesArea of circle: 78.5 square inches
The area of a circle with radius r is pi*r*r and its circumference is 2*pi*r Use the first to find r and then use that value of r in the second to find the circumference.
No.
A square can't have a circumference. That's only for circles squares have area, volume, or perimeter.
The circumference is 51.125 cm.