Bunuel wrote:

What is the greatest distance between any two points on a cylinder with radius 3 and height 8?

A. √73

B. √80

C. 9

D. √91

E. 10

The greatest distance in a cylinder will be the diagonal from the top left to the bottom right. This diagonal, along with the height of the cylinder and the diameter of the circular base, will form a right triangle with the height and the diameter being the legs and the diagonal being the hypotenuse. We see the two legs of the diagonal are 6 (diameter) and 8 (height). So the hypotenuse of the right triangle, or the diagonal, will be 10.

Answer: E

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