A person standing on the bank of a river, observes that the angle of elevation of the
top of a tree, standing on the opposite bank is 45'. When he moves 40 m away from
the bank, he finds the angle of elevation to be 30. Find the height of the tree and the
width of the river. (Root3 = 1.732)
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A 1.5 m tall boy is standing at some distance from a 30 m tall building. The angle of elevation from his eyes to the top of the building increases from 30° from 60°, as he walks towards the building. Find the distance he walked towards the building.
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