Evaluate the given integral by changing to polar coordinates. sin(x2 + y2) da r , where r is the region in the first quadrant between the circles with center the origin and radii 3 and 4

Aconstruction worker needs to put a rectangular window in the side of a building he knows from measuring that the top and bottom of the window have a width of 8bfeet and the sides have a length of 15 feet he also measured one diagonal to be 17 feet what is the length of the other diagonal