1.

The angle of elevation of the top of a tree from the bank of a river to another is 60°. On going 40 meters backwards perpendicular to the length of the river, this angle of elevation from a point becomes 30 degrees. What is the width of the river?

A. 20 m
B. 12 m
C. 45 m
D. 67 m.
Answer» B. 12 m


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