Probability distribution function/integration

You're not very familiar with this sort of thing, are you?

You defined your distribution to be 0 outside the circle. What's the point in integration out there? You can just do [0,r].

It's a circle. You can use integration if you like, but the area will still be \(\displaystyle \pi r^{2}\).
 
You can use whatever method you like. The area of the circle will be the same.

If you really want a bivariate uniform distribution on this disk, the height of the distribution will be \(\displaystyle \frac{1}{\pi r^{2}}\) throughout the entire surface and zero (0) on the outside.
 
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