The ratio between the curved surface area and the total surface area of a right circular cylinder is 1 : 2. If the total surface area is 616 cm2, then the volume of the cylinder is
Total surface area of a cylinder = 
Curved surface area of a cylinder = 
⇒ 2h=r + h ⇒ h = r
Given that total surface area = 616 cm 2
⇒ 
⇒ r2 = 7× 7
So, r = h = 7 cm
Volume of a cylinder = 
31