Question

Suppose the diameter of a circle is 4units. What is its circumference?

Answer 1

C = 12.6 (rounded to the nearest tenth)

Explanation:

The formula for the circumference of a circle is C = 2πr

R = radius

The radius is the half of a diameter, so 4/2 is 2.

C = 2π(2)

C = 12.56637061