Trigonometric Ratios and Identities
Quick practice
Question 1 of 5
A person standing in the bank of the river observes that the angle of elevation of the top of a tree on the opposite banks of the river is 
and when he moves 40 m away from the tree the angle of elevation becomes 
. The breadth of river is:
A
30 m
B
60 m
C
40 m
D
20 m
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