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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

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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• 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

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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## 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