# Math Help - Double Integral

1. ## Double Integral

I need help setting up this problem

Electric charge is distributed over the disk $x^2+y^2 \leq 19$
so that the charge density at (x,y) is $\sigma(x,y)=9+x^2+y^2$ coulombs per square meter.
Find the total charge on the disk.

2. What's the definition of total charge? Is it...

$\int\int_D \sigma dA$?

Anyhow this looks like polar to me.