The area of the base of a right circular cylinder is 81π cm2 and height of the cylinder is 14cm. Find its curved surface.
Base area of a cylinder = πr2=81π⇒r=9cm
Height of cylinder = h=14cm
Curved surface area of cylinder = 2πrh=2×227×9×14=792cm2
∴ The curved surface area of the cylinder is 792cm2.