A person, standing on the bank of a river, observes that the angle subtended by a tree on the op...

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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 \( 60^{\circ} \); when he retires \( 20 \mathrm{~m} \) from the bank he finds the angle to be \( 30^{\circ} \); find the height of the tree
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