Question

what is the correct formula for the area of this circle?
18
a = π(9²)
a = π + 9 + 9
a = π + 9
a = 18π

Explanation:

Step1: Find radius from diameter

The diameter is 18, so radius $r = \frac{18}{2} = 9$.

Step2: Apply circle area formula

The area formula for a circle is $A = \pi r^2$. Substitute $r=9$:
$A = \pi(9^2)$

Answer:

A. $A = \pi(9^2)$