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A person standing on the bank of a river observes that the angle subtended by a tree on the opposite bank is `60^(@)`, when he retreats 40m from the bank he finds the angle to be `30^(@)`. Find the height of the tree and the breadth of the river.

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A person standing on the bank of a river observers that the angle subtends by a tree on the opposite bank is 60^(@) . When he retires 40 feet from the bank, he finds the angle to be 30^(@) . Find the height of the tree and the breadth of the river.

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