A cylinder with radius r and height h is closed on the top and botton. Which of the following expressions represents the total surface area of this cylinder ?

(a) $2 π$ r(r+h) (b) $π$ r(r+2h)

(c) $π$ r(2r+h) (d) $2 π r^{2}$ + h

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Solution

r is the radius of the base and h is the height of a closed cylinder

Then total surface area = $2 π$ r(r+h)

hence the correct answer is (a) $2 π$ r(r+h)

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