The ratio of the curved surface area and the total surface area of a circular cylinder is 1:2 and the total surface area is 616 cm2. Find its volume.
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 = 
23