The frame of a lampshade is cylindrical in shape. It has base diameter 28 cm and height 17 cm. it is to be covered with a decorative cloth. A margin of 2 cm is to be given for folding it over top and bottom of the frame. If 1/12 of cloth is wasted in cutting and pasting, find how much cloth is required to be purchased for covering the frame.

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Answers

2016-03-23T08:48:21+05:30
Diameter = 28 cm
Radius = 28/2 = 14
Height = 17 cm
Height including margins = 17 + 2 + 2 = 21 cm

LSA of the cylinder = 2πrh
LSA = 2 × 22/7 × 14 × 21
LSA = 924 cm²

But, since 1/12 of cloth is wasted

Total cloth reqd. = 924 + 1/12(924)
= 924 + 77
= 1001 cm²
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