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An unused roll of paper towels is shown. What is the volume of the unused roll?

 

 Feb 24, 2021
 #1
avatar+939 
+1

Volume of roll = (volume of big cylinder) - (volume of little cylinder)

 

The volume of a cylinder with radius r and height h is \(\pi r^2 h.\)

 

\(V = \pi (\frac{12}{2})^2(26) - \pi (\frac{4.2}{2})^2(26) = \boxed{821.34}\) cm^3.

 Feb 24, 2021
 #2
avatar+483 
+1

Volume = 62π(26) - (2.1)2π(26)

             = 26(36π - 4.41π)

             = 26(31.59π)

             = 821.34π cm3

 Feb 24, 2021

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