Question

The radius of a circle is 9. Using π, which equation expresses the ratio of the circumference of the circle to the circle's diameter? A) C /9 = π B) C /18 = π C) C = 9π/r D) C = r /18π

Answer 1

option B

diameter = 2 × radius = 2 × 9 = 18

circumference = pi × 18 = 18pi

18pi/18

on simplifying this, we get pi.

Answer 2

The answer is C.

Explanation: