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# Sides of an Oblique Triangle

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.

## Sides of an Oblique Triangle

Find the side of an oblique triangle using the Law of Cosines

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## Using the Law of Cosines with SAS (to find the third side)

This lesson covers using the Law of Cosines to find the third side of a triangle.

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• PLIX

## Sides of an Oblique Triangle: Amphitheater Front Row Seats

Sides of an Oblique Triangle Interactive

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• Video

## Example: Application of the Law of Cosines

Shows an example of using the Law of Cosines to find the length of a triangle's missing side.

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• Practice
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