Chapter 13.3, Problem 27E

Cartesian to polar coordinates Sketch the given region of integration R and evaluate the integral over R using polar coordinates.

27.     ${\displaystyle \underset{R}{\iint }\frac{dA}{\sqrt{16-x^2-y^2}};}$

R = {(x, y): x² + y² ≤ 4, x ≥ 0, y ≥ 0}