divide dy pi. the rule is diiameter (or 2 radius) multiplied by pi equals circumference
so: 2 pi x radius= circ
and, since diameter is 2 times the radius, pi x D= circ
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The diameter is 7
circumference of a circle = pie times the diameter = 22/7 x diameter = 22/7 x 7 inches = 22 inches
The circumference of a circle if the diameter is 7 inches and Pi is 3.14 is: about 21.98 inches.
Circumference = 7*pi inches
A circle with a diameter of 7 cm has a circumference of approx 21.991 cm.