7. The inner diameter of a circular well is 3.5 m. It is 10 m deep. Find
() its inner curved surface area,
(ii) the cost of plastering this curved surface at the rate of 7 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.
9. Find
1
() the lateral or curved surface area of a closed cylindrical petrol storage tank that is
4.2 m in diameter and 4.5 m high.
(i) how much steel was actually used, if of the steel actually used was wasted in
12
making the tank.
10. In Fig. 13.12, you see the frame of a lampshade. It is to be
covered with a decorative cloth. The frame has a base
diameter of 20 cm and height of 30 cm. A margin of 2.5 cm
is to be given for folding it over the top and bottom of the
frame. Find how much cloth is required for covering the
lampshade.
Fig. 13.12
11. The students of a Vidyalaya were asked to participate in a competition for making and
decorating penholders in the shape of a cylinder with a base, using cardboard. Each
penholder was to be of radius 3 cm and height 10.5 cm. The Vidyalaya was to supply
the competitors with cardboard. If there were 35 competitors, how much cardboard
was required to be bought for the competition?
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