Question

Help!

What is the constant of proportionality between any circle's circumference and diameter?
A. r
B.πr
C.π
D.2π​

Answer 1

C.π

Explanation:

The formula for circumference is given by

C = pi * diameter

C = pi *d

Divide each side by d

C/d = pi*d/d

C/d = pi

The constant of proportionality is pi

They are directly proportional