Question

The radius of a circle is 9 feet. what is the diameter? give the exact answer in simplest form.

Answer 1

• 18 feet

Explanation:

The radius is always 2 times the diameter. Since the radius is
`9 ~feet`, the diameter is
`9\cdot2=\boxed{18}~feet`

Answer 2

The diameter of a circle equals twice the radius of that circle.

Then:

`\begin{gathered} D=2* r \\ =2*9ft \\ =18ft \end{gathered}`

Therefore, the diameter of the circle is:

`18\text{ feet}`