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20-04-2017
Mathematics

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

Respuesta :

20-04-2017

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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