# 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

by CK-12 //at grade
This concept teaches students the Triangle Sum Theorem, and how to use it.
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## Understanding the Angle Measures of Triangles

by CK-12 //at grade
Learn to understand the angle measures of triangles.
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## SLT 40 Prove & apply interior angles of a triangle have a sum of 180 degrees.

by MCPS Math //at grade
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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

by Christine Zadylak //basic
Apply the Triangle Sum Theorem.
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## Triangle Sum Theorem: Introduction

by Susan Sudberry //at grade
Recognize the sum of the interior angles of a triangle as 180 degrees
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## Triangle Sum Theorem Continued

by Susan Sudberry //at grade
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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## Triangle Sum Theorem

by CK-12 //at grade
Learn about the sum of the angles of triangles.
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• PLIX

## Triangle Sum Theorem

by CK-12 //at grade
Triangle Sum Theorem Interactive
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• PLIX

## Triangle Sum Theorem: Creating Right Triangles

by CK-12 //at grade
Triangle Sum Theorem Interactive
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• PLIX

## Angle Measures in Given Triangles: Lighthouse

by CK-12 //at grade
Triangle Sum Theorem Interactive
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• PLIX

## Bike Ramp

by CK-12 //at grade
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

by CK-12 //at grade
This video gives more detail about the mathematical principles presented in Triangle Sum Theorem.
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• Video

## Triangle Sum Theorem Examples

by CK-12 //at grade
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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• Critical Thinking

## Triangle Sum Theorem Discussion Questions

by CK-12 //at grade
A list of student-submitted discussion questions for Triangle Sum Theorem.
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• Real World Application

## Triangle Sum Theorem

by CK-12 //at grade
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

by CK-12 //at grade
This study guide reviews terminology for triangles, different types of triangles, and interior and exterior angles theorems.
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## Angle Activities

by Kyle Bardman //basic
This link will help you better understand middle school math.
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## Angle Activities

by Isha //basic
This link will help you better understand middle school math.
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• Flashcards

## Understanding the Angle Measures of Triangles

by Ellaine Chou //basic
These flashcards are here to help you better understand 8th grade math.
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• Flashcards

## Triangle Sum Theorem

by Galaxy Portillo //basic