# How do you use the law of cosines if you are given three sides 9, 6, 14?

##### 1 Answer

Jul 4, 2015

#### Answer:

Solve triangle knowing the 3 sides.

#### Explanation:

Use trig identity: c^2 = a^2 + b^2 - 2abcos C. Find angles A, B, and C

196 = 81 + 36 - 108cos C

108cos C = 117 - 196 = -79 ->

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