A person standing on the bank of a river observe that the angle subtended a tree on the opposite bank is 60°.When he retreate 20m from the bank, he find the angel 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 observes that the angle of elevation of the top of a tree standing on the opposite bank is 60°. When he moves 40 metres 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. Let CD be the tree of height h m.
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