Question

Based on the information given, which formula should we use to calculate the circumference of the circle?

C=πd
C=2πr

Answer 1

Explanation:

The two formulas are essentially the same. Recall that 2r = d (and of course d = 2r). If you're given the diameter, d, use C = πd; if you're given the radius, use C = 2πr.

Answer 2

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