A person standing on the bank of a river observes that the angle of elevation of the top of a tree on the opposite bank of the river is and when he retires 40 meters away from the tree the angle of elevation becomes
. The breadth of the river is
As we learnt in
Height and Distances -
The height or length of an object or the distance between two distant objects can be determined with the help of trigonometric ratios.
-
Let OB represent bank, OA=height=h
Option 1)
This option is incorrect
Option 2)
This option is incorrect
Option 3)
This option is correct
Option 4)
This option is incorrect
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