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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 `60^(@)`. 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. `(sqrt3=1.73)`

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The correct Answer is:
Height of tree is 34.6m and width of the river is 20 m.
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