## Algebra: A Combined Approach (4th Edition)

$r$=$\frac{5}{\sqrt \pi}$
Step 1: The formula to be used here is, $r$=$\sqrt\frac{A}{\pi}$ Step 2: According to the question, A= 25 square meters Step 3: Substituting the value of A into the equation, $r$=$\sqrt\frac{25}{\pi}$ Step 4: $r$=$\frac{5}{\sqrt \pi}$