SOLUTION: A triangle has sides a=3 and b=6 and angle C=60 degrees. Find the length of side c.

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Question 1196144: A triangle has sides a=3 and b=6 and angle C=60 degrees. Find the length of side c.
Answer by ikleyn(52787) About Me  (Show Source):
You can put this solution on YOUR website!
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Angle C is concluded between the sides "a" and "b".

Apply the cosine law to find the third side of the triangle, opposite to the given angle.


On cosine law, see your textbook (or any textbook on Geometry/Trigonometry).


An alternative source are the lessons in this site

    - Solve triangles using Law of Cosines

    - Proof of the Law of Cosines revisited