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A man standing on the bank of a river observes that the angle of elevation of a tree on the opposite bank is 60 degrees. When he retires 10 m from the bank, he finds the angle of elevation to be 30 degrees. Find the breadth of the river.

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A man standing on the bank of a river observes that the angle of elevation of a tree on the opposite bank is 60 degrees. When he retires 10 m from the bank, he finds the angle of elevation to be 30 degrees. Find the breadth of the river.
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