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Example 1
A ladder reaches the top of a building. The lower
end of the ladder is 25' apart from the base of the building. The
angle of elevation of the ladder is 640. Find the height
of the building and length of the ladder.
Solution
Let 'h' be the height and 'l ' be the length.
The adjoining fig. illustrates the conditions of the problem.
\ Height of the building = 51.25 '
\ length of the ladder = 57.02'.
Example 2
An observer O, 200 m above sea level, observes the angle of depression
of a ship 's' at sea to be 460 . Find the horizontal
distance between the ship and the observer.
Solution
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