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# Determination of Unknown Angles Using Law of Cosines

## Find unknown angle given lengths of all 3 sides

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.
• Read

## Determination of Unknown Angles Using Law of Cosines

by CK-12 //at grade

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

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• Read

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

by CK-12 //at grade

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

by CK-12 //at grade

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

by CK-12 //at grade

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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## Determination of Unknown Angles Using Law of Cosines Practice

by CK-12 //at grade
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• Pre and Post Read

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

by CK-12 //at grade

To activate prior knowledge, to generate questions about a given topic, and to organize knowledge using a KWL Chart.

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