Question

What is the exact circumference of a circle with a radius of 15 cm?

A: 10π cm
B: 15π cm
C:30π cm
D: 60π cm

Answer 1

C:30π cm

Explanation:

The formula for the circumference of a circle is

C = 2πr

Since the radius is 15 cm, this makes 2r = 2(15) = 30 cm. This makes the circumference

C = 30π cm

Answer 2

Answer: C: 30π cm

Explanation:

The circumference of a circle is given by :-

`C= 2\pi r` , where r is the radius of the circle.

We are given that : The radius of the circle = 15 cm

then , the circumference of the circle will be :-

`C= 2\pi (15)\ cm\\\\\Rightarrow\ C=2*15\pi\ cm\\\\\Rightarrow\ C=30\pi \cm`

Therefore, the exact circumference of a circle with a radius of 15 cm =
`30\pi \cm`

Thus , the correct option is C: 30π cm