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

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Answers

2016-02-28T18:18:56+05:30
The 2cm on each side add to the height. So new height would be 17+4=21=h. 
d=R/2 so radius is 14cm.
2*pi*R*h. use this formula. Take pi as 22/7 it divides with 14 and 21
so you get 1848cm2. 
Also, 1.5cm2 cloth is also wasted in cutting and pasting, so add that. You get 1848+1.5=1849.5cm2

Hope this helped
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