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# Triangle Inequality Theorem

## Sum of the lengths of any two sides of a triangle is greater than the third side.

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 Inequality Theorem

This concept teaches students the Triangle Inequality Theorem and how to apply it.

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• Video

## Triangle Inequality Theorem Principles

This video gives more detail about the mathematical principles presented in Triangle Inequality Theorem.

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• Video

## Triangle Inequality Theorem Examples

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

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• Practice
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## Triangle Inequality Theorem Practice

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• Critical Thinking

## Triangle Inequality Theorem Discussion Questions

A list of student-submitted discussion questions for Triangle Inequality Theorem.

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## Triangle Inequality Theorem Pre Read

To activate prior knowledge, make personal connections, reflect on key concepts, encourage critical thinking, and assess student knowledge on the topic prior to reading using a Quickwrite.

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## Triangle Inequality Theorem Post Read

To stress understanding of a concept by summarizing the main idea and applying that understanding to create visual aids and generate questions and comments using a Concept Matrix.

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• Real World Application

## Triangle Inequality Theorem

How long ago was the triangle inequality theorem first written down?

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• Study Guide