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# Determination of Unknown Angles Using Law of Cosines

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.

## Determination of Unknown Angles Using Law of Cosines

Find an unknown angle of a side side side triangle using the Law of Cosines

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## Using the Law of Cosines with SSS (to find an angle)

This lesson covers using the Law of Cosines to find an angle in a triangle.

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• PLIX

## Determination of Unknown Angles Using Law of Cosines: Backyard Party

Determination of Unknown Angles Using Law of Cosines Interactive

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• Video

## Example: Determine the Measure of an Angle of a Triangle Given the Length of Three Sides

Gives an example of using the Law of Cosines to find the measure of the largest angle of a triangle, given the lengths of all three sides.

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• Practice
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