Looks like you need to review the basic trig functions and draw useful diagrams.
#1 h/15 = tan 46.48°
#2 h/17.2 = tan 73.5°
1. From a point 15m from the base of a tree, the angle of elevation of the top of the tree is 46.48degrees. Approximate the height of the tree.
2. From a point 17.2m from the base of a building, the angle of elevation of the top of the building is 73.5degrees. Aproximate the height of the building.
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