Find the ratio BH / B'H' of the lengths of the altitudes of the two triangles. The two triangles are similar and the ratio of the lengths of their sides is equal to k: AB / A'B' = BC / B'C' = CA / C'A' = k. ![]() Hence the proportionality of the sides gives: Since PP' and MM' are parallel, the triangles LPP' and LMM' are similar. PP' and MM' are vertical to the ground and therefore parallel to each other. We assume that the light source mount, the pole and the altitude of the mountain are in the same plane. The distance between the pole and the laser is 10 meters. The distance between the altitude of the mountain and the pole is 1000 meters.
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