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## Homework Statement

A solid rotor ring is made by rotation round the x-axis the area enclosed between the lines y=x+5 and y=2x+7 between the x-values x=0 and x=1.

Find its volume.

## Homework Equations

n/a

## The Attempt at a Solution

[tex]ytobeintegrated = 2x+7-x-5 \\= x+2\\\int (x=2)dx \\=\left[\frac{x^2}{2}+2x\right](between 1 and 0) \\=3.5 units[/tex]

What next? I think this is only giving me the area in one plane? Do i just multiply by 360 degrees?