A solid cylinder of radius r and height h is placed over other cylinder of same height and radius. The total surface area of the shape so formed is? A. 4πrh + 4πr2 B. 4πrh − 4πr2 C. 4πrh + 2πr2 D. 4πrh − 2πr2 Answer Workspace Report Discuss Answer with explanation Answer: Option C Explanation Since the total surface area of cylinder of radius r and height h = 2πrh + 2πr2. When one cylinder is placed over the other cylinder of same height and radius, Then height of new cylinder = 2h And radius of the new cylinder = r Therefore total surface area of new cylinder = 2πr (2h) + 2πr2 = 4πrh + 2πr2 Workspace
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