Question

Pi is the ratio of _____ to ______

A. area to diameter
B. perimeter to area
C. radius to diameter
D. circumference to diameter

Answer 1

D. circumference to diameter

Explanation:

`\text{The formula of a circumference of a circle:}\ C=d\pi\\\\d-diameter\\\\d\pi=C\qquad\text{divide both sides by}\ d\\\\\pi=(C)/(d)`

Answer 2

The answer is D. C ÷ d = π, where C is circumference and d is diameter.