You buy two rolls of wrapping paper. each roll has the same lateral surface area. what is the diameter of roll B?

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asked Nov 12, 2016 29.9k views

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Romona · Answer 1 · 2016-11-18T18:57:18+0000

The area of lateral surface is equal that the perimeter multiply by the length. So the lateral surface area of roll A is 3*π*30=90π. Roll B: d*π*24=24dπ. Put them together: 90π=24dπ. So d=3.75 in.

You buy two rolls of wrapping paper. each roll has the same lateral surface area. what is the diameter of roll B?

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