Consider the triangular region with dimensions B and H as shown below. H B a) Write a Riemann sum approximating the area of the triangular region using vertical strips as shown. Your answer will also have B and H in it. b) Suppose x, B and H are measured in meters and the density of the triangle in kg/m² is proportional to x. Set up, but do not evaluate, an integral representing the total mass of the triangle. Include units in your answer.