Question

the radius of a circular garden is 9 meters. what is its area?
a. $81\pi\\ \mathrm{m}^2$
b. $64\pi\\ \mathrm{m}^2$
c. $72\pi\\ \mathrm{m}^2$
d. $36\pi\\ \mathrm{m}^2$

Explanation:

Step1: Recall circle area formula

The area of a circle is given by $A = \pi r^2$, where $r$ is the radius.

Step2: Substitute radius value

Substitute $r = 9$ m into the formula:
$A = \pi \times 9^2$

Step3: Calculate the squared radius

$9^2 = 81$, so $A = 81\pi$

Answer:

a. $81\pi \text{ m}^2$