The circumference is the distance around a closed curve. Circumference is a special perimeter.
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By definition pi is the ratio between the circumference and the diameter pi=C/D so C=pi*D and C=pi*40=125.6 (if pi=3.14)
Circumference = pi x diameter = pi x 2 x Radius (By definition - Step 1) So Radius = (Circumference)/(pi x 2), (find Radius - Step 2) Area = pi x Radius x Radius, (substitute value or radius obtained in step 2)
A circumference is 4
25.13 feet is the circumference. (diameter x pi = circumference).
circumference = pi*diameter or pi = circumference/diameter