Surface Area of a Solid of Revolution

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This Demonstration shows the approximation steps that lead to the derivation of the general formula for the surface area of a solid of revolution about the axis: . The first view (solid) shows that the surface is a union of bands like the one swept out by the arc PQ. The second view (frustum of a cone) shows how the line segment joining P and Q sweeps out a frustum of a cone. The last view (arc length) shows the dimensions associated with the arc and line segment PQ.

Contributed by: Mito Are (Collin College) (March 2011)
Open content licensed under CC BY-NC-SA


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