A person standing on the bank of a river observes that the angle subtended by a tree on the opposite bank is 60°. When he retires 40 meters from the bank, he finds the angle to be\[{{30}^{o}}\]. The breadth of the river is [IIT 1975; AIEEE 2004]

A person standing on the bank of a river observes that the angle subte

1.	A person standing on the bank of a river observes that the angle subtended by a tree on the opposite bank is 60°. When he retires 40 meters from the bank, he finds the angle to be\[{{30}^{o}}\]. The breadth of the river is [IIT 1975; AIEEE 2004]
A.	20 m
B.	40 m
C.	30 m
D.	60 m
Answer» B. 40 m

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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°. When he retires 40 meters from the bank, he finds the angle to be\[{{30}^{o}}\]. The breadth of the river is [IIT 1975; AIEEE 2004]

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