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AnilSinghBora
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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. (Assume π = 22/7) Q.10

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How can i solve this tough question of class 9th ncert of Surface areas and Volumes of math of exercise 13.2    of question no.10 . Give me the best and simple way for solving this question.  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. (Assume π = 22/7)

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  1. Say h = height of the frame of lampshade, looks like cylindrical shape

    r = radius

    Total height is h = (2.5+30+2.5) cm = 35cm and

    r = (20/2) cm = 10cm

    Use curved surface area formula to find the cloth required for covering the lampshade which is 2πrh

    = (2×(22/7)×10×35) cm2

    = 2200 cm2

    Hence, 2200 cm2 cloth is required for covering the lampshade.

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