Definite Double Integral on Wolfram

[ahaanomegas]

How would you solve the following problem on Wolfram|Alpha (www.wolframalpha.com)? [Broken]

Problem

If $C$ is a circle or radius $1$ with equation $x^2+y^2=1$, find

$\iint_{C} (x^2 + y^2) \cdot \mathrm{d}x \cdot \mathrm{d}y$​

 

[Bill Simpson]

Fall back on Mathematica notation

http://www.wolframalpha.com/input/?i=4*Integrate[x^2+++y^2,+{x,+0,+1},+{y,+0,+Sqrt[1+-+x^2]}]