Question

A cylinder with radius r and height h is closed on the top and bottom. Which of the following expressions represents the total surface area of this cylinder?
A. 2πr(r+h)
B. πr(r+2h)
C. πr(2r+h)
D. 2πr²+h

Answer 1

2πr ( r + h) - option A represents the total surface area of this cylinder

Step-by-step explanation:

A cylinder with radius r and height h is closed on the top and bottom.

total surface area of this cylinder = 2πrh  + πr² + πr²

= 2πrh  + 2πr²

= 2πr ( h + r)

= 2πr ( r + h)

2πr ( r + h) - option A represents the total surface area of this cylinder

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Answer 2

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A. 2πr(r+h)