A person standing on the bank of a river observes that the angle of elevation of the top of a tree on the opposite bank is 45 degrees. When he moves 20 m away from the bank, he finds the angle of elevation to be 30 degrees. Find the height of the tree.
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Answer:
the angle of elevation of a cloud is 30°.
Step-by-step explanation:
The angles of elevation of the top of the tree from point A and B are 30° and 60° respectively, i.e., ∠CAD = 30° and ∠CBD = 60°. Let BC = x m. Hence, the width of the river is 20 m. At a point A, 20 metres above the level of water in a lake, the angle of elevation of a cloud is 30°.
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