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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

This concept teaches students the Triangle Sum Theorem, and how to use it.
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## Understanding the Angle Measures of Triangles

Learn to understand the angle measures of triangles.
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## Triangle Sum Theorem

Learn about the sum of the angles of triangles.
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• PLIX

## Triangle Sum Theorem

Triangle Sum Theorem Interactive
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• PLIX

## Triangle Sum Theorem: Creating Right Triangles

Triangle Sum Theorem Interactive
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## Angle Measures in Given Triangles: Lighthouse

Triangle Sum Theorem Interactive
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## Bike Ramp

Triangle Sum Theorem Interactive
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• Video

## Triangle Sum Theorem Principles

This video gives more detail about the mathematical principles presented in Triangle Sum Theorem.
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## Triangle Sum Theorem Examples

This video shows how to work step-by-step through one or more of the examples in Triangle Sum Theorem.
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## Triangle Sum Theorem Quiz

Ten question quiz. Students must solve for missing angles in triangles using the triangle sum theorem and basic arithmetic and their algebra skills.
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• Critical Thinking

## Triangle Sum Theorem Discussion Questions

A list of student-submitted discussion questions for Triangle Sum Theorem.
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• Real World Application

## Triangle Sum Theorem

Do the angles in a triangle always add up to 180 degrees? How are the lengths of the sides of a triangle controlled by the sizes of the angles in Spherical Geometry?
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• Study Guide