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jonny [76]
4 years ago
8

A roll of paper towels is 11 inches high and 6 inches in diameter. If a 300- square inch sheet of plastic is provided to wrap th

e paper towels, how much extra plastic is there ?
Mathematics
1 answer:
Sloan [31]4 years ago
6 0

Answer:

  36.1 in²

Step-by-step explanation:

The total surface area of a cylinder of height h and radius r is given by ...

  SA = 2πr² + 2πrh = 2πr(r+h)

For a cylinder of height 11 inches and radius 3 inches, the surface area is ...

  SA = 2π(3 in)(3 in +11 in) = 84π in² ≈ 263.9 in²

Then the "extra" wrap area is ...

  300 in² -263.9 in² = 36.1 in²

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Answer:

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Step-by-step explanation:

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3 years ago
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