volume

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.

Volume = 6²π(26) - (2.1)²π(26)

             = 26(36π - 4.41π)

             = 26(31.59π)

             = 821.34π cm³