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10.6: The Calculus of Polar Curves

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Try graphing this on the TI-89. 10.6: The Calculus of Polar Curves. Greg Kelly, Hanford High School, Richland, Washington. To find the slope of a polar curve:. We use the product rule here. To find the slope of a polar curve:. Example:. Area Inside a Polar Graph:.

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Try graphing this on the TI-89.

10.6: The Calculus of Polar Curves

Greg Kelly, Hanford High School, Richland, Washington

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To find the slope of a polar curve:

We use the product rule here.

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Area Inside a Polar Graph:

The length of an arc (in a circle) is given by r.q when q is given in radians.

For a very small q, the curve could be approximated by a straight line and the area could be found using the triangle formula:

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Notes:

To find the area between curves, subtract:

Just like finding the areas between Cartesian curves, establish limits of integration where the curves cross.

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When finding area, negative values of r cancel out:

Area of one leaf times 4:

Area of four leaves:

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To find the length of a curve:

Remember:

For polar graphs:

If we find derivatives and plug them into the formula, we (eventually) get:

So:

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There is also a surface area equation similar to the others we are already familiar with:

When rotated about the x-axis:

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