Question

Circle O has a circumference of 36π cm. What is the length of the radius, r?

Answer 1

Answer:

The length of the radius, r is 18 cm.

Step-by-step explanation:

If the radius of a circle is r, then the circumference of the circle is

$C=2\pi r$

It is given that circle O has a circumference of 36π cm.

$36\pi=2\pi r$

Divide both sides by 2π.

$\frac{36\pi}{2\pi}=\frac{2\pi r}{2\pi}$

$18=r$

Therefore the length of the radius of the circle is 18 cm.

Answer 2

The radius is 5.73 cm.