Circumference of a circle that is 8 inches of what? 8 inches in diameter? 8 inches in radius? Please clarify your question next time.
If it's 8 inches in diameter, the circumference would be as follows:
Circumference of a circle = pi (sorry but I don't know how to type the symbol) x diameter = 3.14 x diameter (if you round pi)
Therefore if diameter=8, circumference = 3.14 x 8 = 25.12 inches.
If the 8 inches is the radius, you multiply that by 2 to get the diameter and use the same formula to find the circumference. (Diameter = 8 x 2 = 16 inches, Circumference = 3.14 x 16 = 50.24 inches.)
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If the diameter of a circle is 12 inches the circumference is: 37.7 inches (diameter x pi = circumference).
A circle with a radius of 9 inches has a circumference of 56.55 inches.
The circumference of a circle when the diameter is 17 inches is: 53 inches.
The circumference of a circle with the diameter 11 inches is 34.56 inches.
If a circle has a circumference of 6 inches the diameter is: 1.91 inches (circumference divided by Pi = diameter).