1. The problem statement, all variables and given/known data 2. Relevant equations N/A 3. The attempt at a solution I solved part a. I got an answer of 140. For part b, however, I am stuck. I came up with a set of points for D in the xy plane [(0,3)(0,6)(4,5)(4,8)] giving me a rhombus. How do i integrate this? I tried to split up the rhombus into two triangles and I still did not get the same answer as a. Where am I going wrong?