Answer:
[tex]\frac{A}{4 \pi} =r^2[/tex]
Step-by-step explanation:
To solve for a variable or piece of an expression, use inverse operations. Since [tex]4 \pi[/tex] is being multiplied to [tex]r^2[/tex], then you will use the inverse operation by dividing both sides by [tex]4 \pi[/tex].
[tex]A = 4 \pi r^2\\\\\frac{A}{4 \pi}= \frac{4 \pi r^2}{4 \pi} \\\\\frac{A}{4 \pi} =r^2[/tex]
