11.A tree stands vertically on the bank of a river. From a point, say

1.	11.A tree stands vertically on the bank of a river. From a point, say A on theother bank directly opposite the tree, the angle of elevation of the top of thetree is 60°. From a point 20 m behind this point A on the same bank, theangle of elevation of the top of the tree is 30°. Find the height of the treeand the width of the river.
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11.A tree stands vertically on the bank of a river. From a point, say A on theother bank directly opposite the tree, the angle of elevation of the top of thetree is 60°. From a point 20 m behind this point A on the same bank, theangle of elevation of the top of the tree is 30°. Find the height of the treeand the width of the river.

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