Question

A pole 40m high on the bank of a stream makes an angle of 30° with a place on the opposite bank. find the breadth of a stream
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Answer 1

Answer:

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Let B be the position of a man standing on the opposite bank of the river. After moving 40 m away from point B let new position of man be A i.e., AB = 40 m. 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°.