You have the correct idea. The area A of a circle is given by A = π r2 where r is the radius of the circle and π is approximately 3.1416. Dividing both sides of this equation by π gives A/π = r2 and hence if you know A, divide it by π and then take the square root to find r.
Answer:
see explanation
Step-by-step explanation:
The area (A) of a circle = πr² ← r is the radius
If A is given then to find r
πr² = A ( isolate r² by dividing both sides by π )
r² = [tex]\frac{A}{\pi }[/tex]
Take the square root of both sides
r = [tex]\sqrt{\frac{A}{\pi } }[/tex]
