Frame of a lampshade is cylindrical in shape .it has base diameter 28 cm and height 17 cm .it is covered with a decorative cloth a margin of 2 cm is given for floding it over top & bottom of the frame . if 1/12 of the cloth is wasted in cutting and pasting find how much cloth is requried to be purchased for covering the frame

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Answers

2016-03-27T21:41:32+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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