Answer
$\text{ approximately } 14,657,414 \text{ square miles}$
Work Step by Step
Substituting $r=1080$ in the given formula, $
r=\sqrt{\dfrac{A}{4\pi}}
,$ results to
\begin{array}{l}\require{cancel}
1080=\sqrt{\dfrac{A}{4\pi}}
.\end{array}
Squaring both sides and using the properties of equality, the equation above is equivalent to
\begin{array}{l}\require{cancel}
(1080)^2=\left(\sqrt{\dfrac{A}{4\pi}}\right)^2
\\
1166400=\dfrac{A}{4\pi}
\\
4\pi\cdot1166400=\dfrac{A}{4\pi}\cdot4\pi
\\
14,657,414=A
.\end{array}
Hence, the surface area of the moon, $A,$ is $
\text{ approximately } 14,657,414 \text{ square miles}
.$
