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What is the formula required to use for T.S.A of an article which is made by digging out a hemisphere from each end of a solid cylinder?(a) C.S.A of the cylinder – 2(C.S.A of the hemisphere)(b) C.S.A of the cylinder + C.S.A of the hemisphere(c) C.S.A of the cylinder + 2(C.S.A of the hemisphere)(d) C.S.A of the cylinder – C.S.A of the hemisphereThe question was posed to me in an interview for job.Origin of the question is Surface Area and Volume of Combination of Solids topic in section Surface Area and Volumes of Mathematics – Class 10

Answer»

The correct choice is (c) C.S.A of the CYLINDER + 2(C.S.A of the hemisphere)

The best I can explain: To FIND the T.S.A of an article which is made by digging out a hemisphere from each END of a solid cylinder, we NEED C.S.A of the cylinder and C.S.A of the hemisphere.

T.S.A of the article = C.S.A of the cylinder + 2(C.S.A of the hemisphere).



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