If the circumference is 8 inches the diameter is: 2.546 inches. (D = c divided by Pi)
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If the circle is 8 inches in diameter, its circumference would be: 25.13 inches (diameter x Pi = circumference)
An 8-foot diameter circle has a circumference of about 25.132 inches.
You need to specify what the '8 inches' represents!!! Is it radius, diameter, or all the way round (circumference).
If a circle has a diameter of 24 inches its circumference is: 75.4 inches (diameter x Pi = circumference).
Circumference = 7.5 inches implies that diameter = 2.387 inches