05+Law+of+Cosines

Law of Cosines Ani Sarajian, Brianna Formicola, Lindsay Goldstein

**Summary:**

When using the law of cosines you can deal with triangles when you have 3 sides and 1 angle. Also, it can be used to find a missing side for a triangle or a missing angle. Using this you can find the missing angles with all three side length and find the third side length when you have the other two and one angle. This is generally used when you cannot use the Law of Sines because you are searching for a third side length.

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Example 1 - solve for c:

Example 2 - solve for the cosine of C:

Example 3 - solve for x