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Question

Find the area of metal sheet required in making a closed hollow cone of base radius 7 cm and height 24 cm.


Solution

Base radius of cone (r)=7 cm and vertical height (h)=24 cm

 Slant height (l)=r2+h2=(7)2+(24)2=49+576=625=25 cmTotal surface area=πrl+πr2=πr(l+r)cm2=227×7(25+7)cm2=22×32 cm2=704 cm2

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