Solve the Equation for the Variable R $A = \pi r ^ { 2 }$

Multiple Choice

Solve the equation for the variable r . Assume that all letters represent positive numbers. $A = \pi r ^ { 2 }$

A) $r = \sqrt { A \pi }$
B) $r = \frac { \sqrt { A } } { \pi }$
C) $r = \sqrt { \frac { A } { \pi } }$