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 d2
b C = pie rd
c C = pie d
d C = 2 pie d

Answer 1

a. C = 2πr

c. C= πd

both are correct

Answer 2

C

Explanation:

C=2pier or pied