Question

question: calculate the area of a circle with radius 3 (in terms of π). (3 points)
a) 6π
b) 9π
c) 18π
d) 3π

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 $r = 3$, substitute it into the formula: $A=\pi\times3^{2}$.

Step3: Calculate the result

$3^{2}=9$, so $A = 9\pi$.

Answer:

B. $9\pi$