How to calculate volumes of revolution (Part 4 of 6)

Imagine that it is possible to cut open and straighten out the torus to create a cylinder with length determined by the length of the torus along its centreline (your e value). Show that the volume of this cylinder is the same as that of your torus.

This is the fourth of a series of 6 questions that investigate how to find the volume of solids of revolution using calculus.

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