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UPSC NDA II 2013 Mathematics Paper

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Question : 119 of 120

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A person standing on the bank of a river observes that the angle subtended by a tree on the opposite of bank is 60∘. When he retires 40m from the bank, he finds the angle to be 30∘. What is the breadth of the river?

60m
40m
30m
20m

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