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Calculus II - Notes
 Applications of Integrals Previous Chapter Next Chapter Series & Sequences Arc Length with Polar Coordinates Previous Section Next Section Arc Length and Surface Area Revisited

## Surface Area with Polar Coordinates

We will be looking at surface area in polar coordinates in this section.  Note however that all we’re going to do is give the formulas for the surface area since most of these integrals tend to be fairly difficult.

We want to find the surface area of the region found by rotating,

As we did in the tangent and arc length sections we’ll write the curve in terms of a set of parametric equations.

If we now use the parametric formula for finding the surface area we’ll get,

 where,

Note that because we will pick up a  from the ds we’ll need to substitute one of the parametric equations in for x or y depending on the axis of rotation.  This will often mean that the integrals will be somewhat unpleasant.

 Arc Length with Polar Coordinates Previous Section Next Section Arc Length and Surface Area Revisited Applications of Integrals Previous Chapter Next Chapter Series & Sequences

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