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the observer. The angles of depression of these buoys
from the observer, are 28º and 41º respectively.
Calculate the distance between the two buoys.
19. Kim sees a pylon whose angle of elevation of the top
is 29º, and then walks towards it until that angle is
doubled. If the height of the pylon is 27 metres, how
far did Kim walk?
20. A tower is 60 metres tall. It stands between two
observers, on level ground, and all three (observers
and tower) are in a straight line. Each of the observers
measures the angle of the elevation of the top of the
tower. One sees it as 23º while the other sees it as
54º. How far are the two observers apart?
21. A man standing on the bank of a river notes a
particular tree on the opposite bank. He then walks
80 metres along the riverbank in a straight line. On
looking back he can see that the angle between the
line of his path and a line to the tree is 36º. How
wide is the river?
22. A rhombus has diagonals of lengths 6 cm and 9 cm.
Calculate the siz...
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 Spring '14

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