DIST, then snap to two objects. You'll get the following out:
Distance = 73.5196, Angle in XY Plane = N 81d40'2" W, Angle from XY Plane = S
86d6'1" E
Delta X = -72.5750, Delta Y = 10.6300, Delta Z = -5.0000
"Angle from XY Plane" should be what you are asking.
Engineering is the practice of the art of science - Steve