Question

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

Answer 1

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

Then:

$\begin{gathered} D=2\times r \\ =2\times9ft \\ =18ft \end{gathered}$

Therefore, the diameter of the circle is:

$18\text{ feet}$