Question

In a cylinder, if radius is doubled and height is halved, then what will happen to curved surface area?

Answer 1

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Answer 2

csa of cylinder = 2πrh

radius= 2r,
height= h/2

= 2×22/7× (2r)×h/2
= 2×22/7 ×( 2r )× h/2
= 2×22/7 × rh
= 2πrh