Question

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

Explanation:

Step1: Recall area formula

The formula for the area of a circle is $A = \pi r^{2}$, where $r$ is the radius.

Step2: Substitute radius value

Given $r = 9$ feet, substitute into the formula: $A=\pi\times(9)^{2}$.

Step3: Calculate result

$(9)^{2}=81$, so $A = 81\pi$ square - feet.

Answer:

$81\pi$