Question

radius of base of a cylinder and it's height are given find the curved surface area r=70,h=1.4

Answer 1

curved surface area of cylinder= 2 pie r h
=2×22/7×70×1.4
=2×22×70×0.2
=616sqcm.

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Answer 2

C.S.A of cylinder=2×pie×rh
=2×(22/7)×70×1.4
=2×(22/7)×7×14
=2×22×14
=616cm^2