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25-10-2017
Geography

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A sphere with a diameter of 16mm has the same surface area as the total surface area of a right cylinder with the base diameter equal to the sphere diameter. How high is the cylinder?

A. 16 mm
B. 8 mm
C. 18 mm
D. 14 mm

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Аноним Аноним

25-10-2017

The answer is 8mm and here's how:

4πsquare= 2πrsquare+2πrh
2πsquare=2πrah
R=h
So h=16/2=8mm

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