Question

An equation is given A =
4 π r^2

Answer 1

D

Explanation:

Given

A = 4πr² ( divide both sides by 4π )

`(A)/(4\pi )` = r² ( take the square root of both sides )

`\sqrt{(A)/(4\pi ) }` = r → D

Answer 2

D

Explanation:

A = 4 π r^2

A/(4π) = r^2

r = sqrt(A/(4π))