mayafuentes3 mayafuentes3

08-06-2015
Mathematics

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

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

Verified Answer :

lulu1991 lulu1991

18-06-2015

The area of lateral surface is equal that the perimeter multiply by the length. So the lateral surface area of roll A is 3π30=90π. Roll B: dπ24=24dπ. Put them together: 90π=24dπ. So d=3.75 in.

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