The perimeter of a circle is called its "circumference".
Its length is the diameter multiplied by (pi).
8 pi = 25.133 (rounded)
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A circle with an 8-inch diameter has a perimeter of 25.1 inches.
The perimeter or circumference of a circle = diameter times pi
The perimeter is the diameter times pi. So the perimeter is 20pi ft
Multiply the diameter by pi.
perimeter of a circle = circumference = pi x diameter perimeter = 3.1416 x 12 = 37.7 cm