There are two points, A and B, whose elevations above datum are hA = 2010 ft and hB=1425 ft and whose images a and b on a vertical photograph have photo coordinates xa=2.95 in.. ya=2.32 in., xb=21.64 in., and yb=2.66 in. The camera focal length was 152.4 mm and the flying height above datum 7950 ft
On the same photograph, an image c of a third point C appears Its elevation hc=1455 ft and its photo coordinates are xc=3.20 In. and yc=-2.66 In. Compute the horizontal angles in triangle ABC
