the formula is pi times r squared
pi = 3.14
r = 3
3 squared = 9 so its 3.14 times 9
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Multiply the diameter by Pi (about 3.1416). The result is the circumference:3 x 3.1416 = 9.4248 inches circumference
The circumference of a circle when the radius is 3 inches is: 18.8 inches (r x 2 x Pi = circumference)
A circle with a radius of 3 inches has a circumference of 18.8 inches
A circle with a radius of 8 inches has a circumference of 50.27 inches.
Circumference: 29*pi = 91.106 inches to 3 decimal places