Question

the circumference of a circle is ______

a. 2π

b. the length of the diameter

c. the length of the radius

d. the distance around the circle

Explanation:

Step1: Recall circumference definition

The circumference of a circle is the perimeter of the circle, which is the distance around it.

Step2: Analyze each option

A. $2\pi$ is just a constant - related value and not always the circumference. B. The length of the diameter is $d = 2r$ and not the circumference. C. The length of the radius is $r$ and not the circumference. D. This correctly defines the circumference.

Answer:

D. the distance around the circle