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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

This concept teaches students the Triangle Sum Theorem, and how to use it.
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Understanding the Angle Measures of Triangles

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.

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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

Learn about the sum of the angles of triangles.
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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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• PLIX

Bike Ramp

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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• Critical Thinking

Triangle Sum Theorem Discussion Questions

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