The volume V of a cylindrical can is represented by the formula V=πr2h, where h is the height and r is the radius. A cylindrical can has a volume of 1089π cubic centimeters and a height of 9 centimeters. What is the radius of the can?
V = pi·r2·h
1089pi = pi·r2·9
Divide both sides by pi: 1089 = r2·9
Divide both sides by 9: 121 = r2
Find the square root of both sides: 11 = r