The circumference is the diameter times pi. It will always be approximate because of the nature of pi. In this case, it's approximately 50.2654825
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Multiply the diameter by Pi:8 inches x Pi (about 3.1416) = 25.1328 inches circumference
The diameter is 8. The circumference is 8 pi. The area is 16 pi.
diameter = circumference/pi
25.12. Circumference= pi (3.14) multiplied by 8 (diameter.)
You cannot find the diameter of something from its circumference unless it is a circle and, in that case, diameter = circumference/pi