Segment cd is the altitude of right triangle abc. all three triangles in the figure, abc, cbd, and acd, are similar to each other. if p² = xy, then p is the geometric mean of x and y. in this problem, you will work backwards to outline a proof why the height h of altitude cd is the geometric mean of x and y.2a. set up a proportion that will cross-multiply into the equation h² = xy. (2 points)