you would do all of the same steps backwards, C= pi x d, so you would divide the circumference by pi.
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A circumference is 4
The circumference is the distance around a closed curve. Circumference is a special perimeter.
circumference = pi*diameter or pi = circumference/diameter
25.13 feet is the circumference. (diameter x pi = circumference).
The circumference is 12.56 approximately