<PRE><B>Question 812597</B>
use the law of cosines to find the third side of the triangle
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a^2 = b^2 + c^2 - 2bc cos(t)
where:
b = 220
c = 80
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but first find the included angle t
t = 210 - 115 = 95 degrees
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a^2 = 220^2 + 80^2 - 2*220*80 cos(95)
a^2 = 48400 + 6400 - 2*220*80*(-0.0871557)
a^2 = 48400 + 6400 - 2*220*80*(-0.0871557)
a^2 = 51732.118
a = 227.45
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Answer:
the airplane is about 227.5 miles from its departure point
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