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1.5: Surface Area of Revolution

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The area of a frustum is

A=2πr(length).

If we revolve a curve around the x-axis, we have that the surface area of revolution is given by

Area=2πbay1+(dydx)2dx.

Example 1

Set up an integral that gives the surface area of revolution about the x axis of the curve

y=x2

from 2 to 3.

Solution

We find

(dydx)2=(2x)2=4x2.

Now use the area formula:

A=2π32x21+4x2dx.

We will learn later how to work out this integral. However a computer gives that

A208.09.

Larry Green (Lake Tahoe Community College)

  • Integrated by Justin Marshall.


This page titled 1.5: Surface Area of Revolution is shared under a not declared license and was authored, remixed, and/or curated by Larry Green.

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