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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.
• Read

## Triangle Inequality Theorem

by CK-12 //at grade

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

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• Video

## Triangle Inequality Theorem Principles

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

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• Video

## Triangle Inequality Theorem Examples

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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

by CK-12 //at grade
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• Critical Thinking

## Triangle Inequality Theorem Discussion Questions

by CK-12 //at grade

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

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• Pre Read

## Triangle Inequality Theorem Pre Read

by CK-12 //at grade

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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• Post Read

## Triangle Inequality Theorem Post Read

by CK-12 //at grade

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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• While Read

## Triangle Inequality Theorem Ask, Answer, Learn Table

by CK-12 //at grade

Come up with questions about a topic and learn new vocabulary words to determine answers using an Ask, Answer, Learn table.

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• Real World Application

## Triangle Inequality Theorem

by CK-12 //at grade

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

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• Study Guide

## Inequalities in Triangles Study Guide

by CK-12 //at grade

This study guide is an overview of the triangle inequality theorem and hinge theorem.

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