Question

If r is the radius of a circle and d is its diameter, which of the following is an

equivalent formula for the circumference C = 2 pie r?

A. C= pie d
B. C= 2 pie d
C. C=2 pie d^2
D. C = 2 pie rd

Answer 1

A

Explanation:

because r is 1/2 of d so you would have 1 d instead of 2 r