Question

What equation can be used to find the circumference of the circle below

Answer 1

Below

Explanation:

radius = 4.5 diameter = 2 x 4.5 in

the circumference of a circle is given by the formula p * d

substitute in the underlined equation for 'diameter')

circumference = 2 * 4.5 * pi inches

Answer 2

C = 2 x 4.5 x π

Explanation:

The equation to find the circumference of the circle is

C = 2π · r

r = 4.5 in

Looking at the options, the answer is C = 2 x 4.5 x π