Solid of Revolution

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This Demonstration illustrates how a solid (with a hole) is obtained by rotating a region bounded between two curves about the axis. To see the process unfold, first select "region" and rotate the shaded region about the
axis. Or, select "solid" and rotate the region. Once the solid is obtained, select "transparent" to see its inside.
Contributed by: Lyle Cochran (March 2011)
Open content licensed under CC BY-NC-SA
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"Solid of Revolution"
http://demonstrations.wolfram.com/SolidOfRevolution/
Wolfram Demonstrations Project
Published: March 7 2011