The area of a circle is given by:
Area = (pi)*(Radius^{2})
Where pi = 3.14159... You need to solve for the Radius:
Area/pi = Radius^{2} [Divided both sides of the equation by pi]
√(Area/pi) = Radius [Took the square root (√) of both sides]
Plug in the values for Area (432 cm^{2}) and pi (3.14159) into the formula above to compute the value of the Radius.