Question

Find the radius of a circle with circumference 18cm

Answer 1

`r$\approx$2.9`

Explanation:

The equation for circumference is:

`C=2\pi r`

We can plug 18 cm in for C:

`18=2\pi r`

Divide both sides by 2

`9=\pi r`

Divide both sides by
`\pi`

`r$\approx$2.9`