# Chapter 14 | Mensuration | Class-8 DAV Secondary Mathematics

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## Unit 14 Worksheet 4 || Mensuration

1. Find the curved surface area and total surface area of a right circular cylinder whose height is 15 cm and the radius of the base is 7 cm.

2. The diameter of the base of a right circular cylinder is 4.2 dm and its height is 1 dm. Find the area of the curved surface in cm2.

3. The curved surface area of a cylinder is 1,320 cm2 and its base has a radius of 10.5 cm. Find the height of the cylinder.

4. The circumference of the base of a cylinder is 176 cm and its height is 65 cm. Find its lateral surface area.

5. 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.

6. The outer diameter of a gas cylinder is 20 cm. Find the cost of the painting of its outer curved surface at ₹4 per square centimetre if the height of the cylinder is 70 cm.

7. A cylindrical vessel, open at the top, has a radius 10 cm and height 14 cm. Find the total surface area of the vessel. (Take π = 3.14).

8. The length of a roller is 40 cm and its diameter is 21 cm. It takes 300 complete revolutions to nave once over to level the floor of a room. Find the area of the room in m2.