Question

the radius of a circle is 9 cm. find its area in terms of $pi$. answer attempt 1 out of 2 $a=\text{____} \text{ cm}^2$

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

Step3: Calculate the result

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

Answer:

$81\pi$ $cm^{2}$