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

B: C15=π

C: C=r30π

D: C30=π

The equation which expresses the ratio of the circumference to the diameter of a circle is   ⇒ D

Step-by-step explanation:

π is the ratio between the circumference of the circle and the length of its diameter

, where

∵ The circumference of the circle is C

∵ The radius of the circle is 15 units

∴ r = 15 units

- Find the diameter of the circle

∵ The diameter of the circle d = 2 r

∴ d = 2(15) = 30 units

∴ The diameter of the circle is 30 units

∵

∵ d = 30 units

∴

The equation which expresses the ratio of the circumference to the diameter of a circle is  

2.83941151 would be the answer you're looking for! : )