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pls help on questions :( These are cosine law questions

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30. The Delta Regina Hotel is the tallest building
in Saskatchewan. From the window of
her room on the top floor, at a height of
70 m above the ground, Rian observes a
car moving toward the hotel. If the angle
of depression of the car changes from 180
to 350 during the time Rian is observing it,
determine the distance the car has travelled.
170 m
31. Given AABC where ZC = 90,
a = 12.2 cm, b = 8.9 cm, complete
the following.


22 m 74.630
instrument position
19. The Bermuda Triangle is an unmarked
area in the Atlantic Ocean where there
have been reports of unexplained
disappearances of boats and planes and
problems with radio communications.
The triangle is an isosceles triangle with
vertices at Miami, Florida, San Juan,
tain bike
Puerto Rico, and at the island of Bermuda.
g. The
Miami is approximately 1660 km from
contains two
both Bermuda and San Juan. If the
of the rider.
angle formed by the sides of the triangle
e angle are
sition of
connecting Miami to Bermuda and Miami
of the bike.
to San Juan is 55.50, determine the distance
the frame of
from Bermuda to San Juan. Express your
answer to the nearest kilometre.
seat angle
Gulf of
San Juan
Caribbean Sea
South America


Moondog by Tony Smith
14. Julia and Isaac are backpacking in Banff
National Park. They walk 8 km from their
base camp heading N42.E. After lunch,
they change direction to a bearing of 1370
and walk another 5 km.
a) Sketch a diagram of their route.
b) How far are Julia and Isaac from their
base camp?
c) At what bearing must they travel to
return to their base camp?
2.4 The Cosine Law . MHR 121

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