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Unformatted text preview: Bigfoot Falls from Exericse 5 above both lie on a straight stretch
of the Great Sasquatch Canyon. What bearing would the tour helicopter need to follow to
go directly from Bigfoot Falls to Cliﬀs of Insanity Point?
7. From a point 300 feet above level ground in a ﬁretower, a ranger spots two ﬁres in the Yeti
National Forest. The angle of depression9 made by the line of sight from the ranger to the
ﬁrst ﬁre is 2.5◦ and the angle of depression made by line of sight from the ranger to the second
ﬁre is 1.3◦ . The angle formed by the two lines of sight is 117◦ . Find the distance between the
two ﬁres. (Hint: In order to use the 117◦ angle between the lines of sight, you will ﬁrst need
to use right angle Trigonometry to ﬁnd the lengths of the lines of sight. This will give you a
Side-Angle-Side case in which to apply the Law of Cosines.)
9 Please refer to Exercise 2 in Section 11.2 for an introduction to bearings.
See Exercise 8 in Section 10.3 for the deﬁnition of this angle. 780 Applications of Trigonometry 8. If you apply the Law of Cosines to the ambiguous Angle-Side-Sid...
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