1.

When the radius of a cylinder is double its height, find the relation between its C.S.A. and base area.

Answer»

r = 2h

∴ Base area = πr2 = π(2h)2 = 4πh2

C.S.A. of cylinder = 2πrh = 2π(2h)h 

 = 4πh2

Hence, C.S.A. = Base area



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