Question 7
A closed cylindrical tank of radius 7 m and height 3 m is made from a sheet of metal.How much sheet of metal is required?
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Solution
Given, Radius of cylindrical tank r = 7 m
Height of cylindrical tank h= 3 m
Total surface area of cylindrical tank = 2π r(h+r) =2×227×7(3+7)=44×10=440m2
Hence 440m2metal sheet is required