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InterviewSolution
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In Fig. 13.12, you see the frame of a lampshade. It isto be covered with a decorative cloth. The frame has a base diameter of 20 cmand height of 30 cm. A margin of 2.5 cmis to be given for folding it over the top and bottomof the frame. Find |
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Answer» Clearly, the decorative cloth forms a cylinder of base diameter 20 cm and height `= (30 + 2.5 + 2.5) cm = 35 cm` Thus, r = 10 cm and h = 35 cm Area of the decorative cloth = lateral surface area of a cylinder having r = 10 cm and h = 35 cm `= (2pi rh) cm^(2)` `= (2 xx (22)/(7) xx 10 xx 35) cm^(2) = 2200 cm^(2)` |
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