Question

What is the radius of this circle if the circumference is 18π cm?
3 cm 9 cm 18 cm 36 cm

Answer 1

I think it's 9cm

Explanation:

Answer 2

The radius is 9 cm.

Explanation:

The formula for calculating the circumference of a circle is

`C=2\pi r`

Where r is the radius and C is the circumference.

It was given in the question that; the circumference,
`C=18\pi cm`.

We substitute this into the formula to obtain;

`18\pi=2\pi r`

Divide both sides by
`2\pi`

`(18\pi)/(2\pi)=r`

`9=r`

The radius is 9cm