# Calculus 3 : Double Integration in Polar Coordinates

## Example Questions

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### Example Question #1 : Double Integration In Polar Coordinates

Evaluate the following integral by converting into Polar Coordinates.

, where  is the portion between the circles of radius  and  and lies in first quadrant.

Explanation:

We have to remember how to convert cartesian coordinates into polar coordinates.

Lets write the ranges of our variables  and .

Now lets setup our double integral, don't forgot the extra .

### Example Question #1 : Double Integrals

Evaluate the integral

where D is the region above the x-axis and within a circle centered at the origin of radius 2.

Explanation:

The conversions for Cartesian into polar coordinates is:

The condition that the region is above the x-axis says:

And the condition that the region is within a circle of radius two says:

With these conditions and conversions, the integral becomes:

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