a rectangular strip 25cm X 7 cm is rotated about the longer side .find the total surface area of the solid thus generated.
The solid so formed is a cylinder of height 25 cm and radius 7 cm and the formula of the total surface area is :
a rectangular strip 25cm X 7 cm is rotated about the longer side .find the total surface area of the solid thus generated.
The solid so formed is a cylinder of height 25 cm and radius 7 cm and the formula of the total surface area is :