Q5 of 62 Page 22

A rectangular strip 25 cm× 7 cm is rotated about the longer side. Find the total surface area of the solid thus generated.

Given,


Dimension of rectangular strip = 25 cm × 7cm


When this strip is rotated about its longer side :


So,


Height of cylinder thus form = 25 cm


Radius = 7 cm


∴ Total surface area of cylinder =


More from this chapter

All 62 →
3

The area of the base of a right circular cylinder is 616 cm2 and its height is 2.5 cm. Find the curved surface area of the cylinder.

 4

The circumference of the base of a cylinder is 88 cm and its height is 15 cm. Find its curved surface area and total surface area.

 6

A rectangular sheet of paper, 44 cm× 20 cm, is rolled along its length to form a cylinder. Find the total surface area of the cylinder thus generated.

 7

The radii of two cylinders are in the ratio 2 : 3 and their heights are in the ratio 5 : 3. Calculate the ratio of their curved surface areas.