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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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## Triangle Sum Theorem

Learn about the sum of the angles of triangles.

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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 and Exterior Angle Theorem

by Jaclyn Tant //basic

Recognize the sum of the interior angles of a triangle as 180 degrees

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## Geometry and Equations (A-7)

by LISD Secondary Math //basic

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## Triangle Sum Theorem

Apply the Triangle Sum Theorem.

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## Triangle Sum Theorem: Introduction

Recognize the sum of the interior angles of a triangle as 180 degrees

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## Triangle Sum Theorem Continued

This concept teaches students the Triangle Sum Theorem, and how to use it.

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## Triangle Sum Theorem.

by Scott Lamie //basic

Apply the Triangle Sum Theorem.

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• PLIX

## Identifying Sets of Pythagorean Triples, Triangle Sum Theorem: Bike Ramp

Triangle Sum Theorem Interactive

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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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• PLIX

## Angle Measures in Given Triangles: Lighthouse

Triangle Sum Theorem Interactive

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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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• Video

## 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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• Video

## Triangle Sum Theorem Principles

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

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• Video

## 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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• Video

## 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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• Video

## 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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• Video

## Proving the Triangle Sum Theorem

by CK-12 //basic

Take a look at proving the 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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• Practice
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## Triangle Sum Theorem Practice

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• Interactive Exercise

## Triangle Sum Theorem

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• Interactive Exercise

## Triangle Sum Theorem Visual

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• Interactive Exercise

## Triangle Sum Theorem Visual 2

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• Interactive Exercise

## Find The Measure of the Third Angle

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• Interactive Exercise

## Find The Measure of the Third Angle 2

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• Interactive Exercise

## Find The Measure of the Third Angle of an Isoceles Triangle

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• Interactive Exercise

## Use Algebra and The Triangle Sum Theorem

Solve for x in the triangle.

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• Interactive Exercise

## Use Algebra and The Triangle Sum Theorem 2

Solve for x in the triangle.

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• Interactive Exercise

## Use Algebra and The Triangle Sum Theorem 3

Use the triangle sum theorem to find the measure of an unknown angle.

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• Interactive Exercise

## Use Algebra and The Triangle Sum Theorem 4

Use the triangle sum theorem to find the measure of an unknown angle.

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• Interactive Exercise

## Given Two Congruent Triangles, Solve for the Unknown Interior Angle

Checks your understanding of the Triangle Sum Theorem.

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• Interactive Exercise

## Given Two Congruent Triangles, Solve for the Unknown Interior Angle (part 2)

Checks your understanding of the Triangle Sum Theorem.

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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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## Triangle Sum Theorem Pre Read

To activate prior knowledge, to generate questions about a given topic, and to organize knowledge using a KWL Chart.

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## Triangle Sum Theorem Post Read

To activate prior knowledge, to generate questions about a given topic, and to organize knowledge using a KWL Chart.

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## Triangle Sum Theorem Stop and Jot

Learn new vocabulary words and help remember them by coming up with your own sentences with the new words using a Stop and Jot table.

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## Recognize the Sum of the Interior Angles of a Triangle as 180 Degrees Post Read

Develop understanding of concepts by studying them in a relational manner. Analyze and refine the concept by summarizing the main idea, creating visual aids, and generating questions and comments using a Four Square Concept Matrix.

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## Understanding the Angle Measures of Triangles

Summarize the main idea of a reading, create visual aids, and come up with new questions using a Four Square Concept Matrix.

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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

## Triangle Relationships Study Guide

This study guide reviews terminology for triangles, different types of triangles, and interior and exterior angles theorems.

1

## Angle Sum Theorem for a Triangle

by CK-12 //basic

A simple interactive that allows you to play with a triangle and see how the angles change when you move on of the vertices.

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## Angle Activities

by Kyle Bardman //basic

1

## Angle Activities

by Isha //basic

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• Flashcards

## Understanding the Angle Measures of Triangles

by Ellaine Chou //basic

0
• Flashcards

## Triangle Sum Theorem

by Galaxy Portillo //basic