17.
A tree is 20_/3 meters length. Find the angle of elevation, if its top
from a point 20 meters away from its foot.
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Answer:
Let AB be the height of the tower and C be the point.
In right △ABC,
tan30o=BCAB
AB=BCtan30o
AB=320=11.56 m
Therefore, the height of the tower is 11.56 m.
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