Question

1. the area of the base of a cylinder with a radius of 3 cm is _____.

a. 9π cm²
b. 6π cm²
c. 18π cm²
d. 3π cm²

Explanation:

Step1: Recall base - area formula

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

Step2: Substitute the radius value

Given $r = 3$ cm, substitute it into the formula: $A=\pi\times(3)^{2}=\pi\times9 = 9\pi$ cm².

Answer:

A. $9\pi$ cm²