Answer:
D
Step-by-step explanation:
A = 4 π r^2
A/(4π) = r^2
r = sqrt(A/(4π))
Given
A = 4πr² ( divide both sides by 4π )
[tex]\frac{A}{4\pi }[/tex] = r² ( take the square root of both sides )
[tex]\sqrt{\frac{A}{4\pi } }[/tex] = r → D
