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# Triangle Sum Theorem

## Interior angles add to 180 degrees

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.

## Triangle Sum Theorem

by CK-12 //basic
Apply the Triangle Sum Theorem.
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• Video

## Triangle Sum Theorem Principles - Basic

by CK-12 //basic
This video provides the student with a walkthrough on the Triangle Sum Theorem.
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## Triangle Sum Theorem Examples - Basic

by CK-12 //basic
This video provides the student with a walkthrough of one or more examples from the concept "Triangle Sum Theorem".
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## Proof - Sum of Measures of Angles in a Triangle is 180

by CK-12 //basic
Proves that the sum of a triangle is 180.
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## Animation of the Sum of the Interior Angles of a Triangle

by CK-12 //basic
Illustrates that the sum of interior angles of a triangle is 180 degrees.
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## Proving the Triangle Sum Theorem

by CK-12 //basic
Take a look at proving the triangle sum theorem.
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