SURFACE AREAS AND VOLUMES
The diameter of a roller is 84 cm and its length is 120 cm. It takes 500 complete
revolutions to move once over to level a playground. Find the area of the playground
in m
5. A cylindrical pillar is 50 cm in diameter and 3.5 m in height. Find the cost of painting
the curved surface of the pillar at the rate of 12.50 per m².
6. Curved surface area of a right circular cylinder is 4.4 m². If the radius of the base of the
cylinder is 0.7 m, find its height.
7. The inner diameter of a circular well is 3.5 m. It is 10 m deep. Find
(1) its inner curved surface area,
(i) the cost of plastering this curved surface at the rate of * 40 per m².
8. In a hot water heating system, there is a cylindrical pipe of length 28 m and diameter
5 cm. Find the total radiating surface in the system.
Find
(1) the lateral or curved surface area of a closed cylindrical petrol storage tank that is
42 min diameter and 45 m high.
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