Asked by indira

Find the radius of a circle given that the circumference is 66cm.
Answered by Ms. Sue
C = pi * 2r

66 = 3.14 * 2r

66 = 6.28r

10.51 = r

Answered by Luc
circumference = pi x d

66cm ÷ pi = 19.098593171 (rounded to the nearest 10th decimal)

the diameter is twice as long as the radius.

19.098593171 ÷ 2 = 9.54929658551
a more simple way to put it is
9.55 (rounded to the hundreth)
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