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The radius of a circle is 15. Using π
π
, which equation expresses the ratio of the circumference to the diameter of a circle?

Question 2 options:

A. C30=π
C
30
=
π

B. C=r30π
C
=
r
30
π

C. C15=π
C
15
=
π

D. C=15πr
C
=
15
π
r