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15 December, 05:43

A square with an area of 81 cm^2 is rotated to form a cylinder. What is the height of the cylinder?

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  1. 15 December, 09:05
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    The area of a square is just:

    A=s^2 so

    s^2=81

    s=9 so if this square is rotated about its center you will get a cylinder with a radius of 4.5 cm and a height of 9 cm.

    So the height is 9 cm
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