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Hello, I have a question and was wondering if someone could help me with it. This is a general vector calculus problem, not specific to Mathematica. I have a simple integral as follows: Given r^2= x^2+y^2, solve Integral[r^2, dr] from point1 (0,0) to point2 (1,1), which would be evaluated from r=0 to r=sqrt and gives answer = 2*sqrt/3. The above is pretty simple, however, I am not sure how to formulate the problem when I convert the 'dr' back to cartesian coordinates as follows: Integrate [x^2+y^2, d????] and the limits??? WHat should 'dr' be in terms of dx? if my integrand is directly x^2+y^2. It cannot be a double integral, since the original problem was a single integral, but then how do you solve this?? Can anyone help? thanks!