Question

a. the radius of the
select choice
484π
11π
30.25π
121π

Explanation:

Step1: Recall radius - diameter relationship

The diameter $d$ of a circle is related to the radius $r$ by the formula $d = 2r$. Given $d=11$ cm, then $r=\frac{d}{2}$.
$r=\frac{11}{2}=5.5$ cm.

Step2: Recall area formula of a circle

The area formula of a circle is $A = \pi r^{2}$. Substitute $r = 5.5$ cm into the formula.
$A=\pi\times(5.5)^{2}=\pi\times30.25 = 30.25\pi$ $cm^{2}$.

Answer:

$30.25\pi$