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

Explanation

Given that: diameter of the base=`20 cm`
Radius of the base =`10 cm`
Height of the frame including folding of`2.5 cm`=`30 cm +2.5 cm+2.5 cm`
=`35 cm`
therefore clothes required =`2pirh`
=`2xx22//7xx10xx35`=`2200 cm^2`
Hence, The required area og clothes covering the lampshade is `2200 cm^2`