# Third Angle Theorem

## Third angles are the same if the other two sets are congruent.

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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.

## Third Angle Theorem

by CK-12 //at grade
This concept introduces students to the Third Angle Theorem.
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• Video

## The Third Angle Theorem Principles

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This video gives more detail about the mathematical principles presented in The Third Angle Theorem.
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## The Third Angle Theorem Examples

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This video shows how to work step-by-step through one or more of the examples in The Third Angle Theorem.
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• Video

## Third Angle Theorem

by CK-12 //at grade
Shows how to use the third angle theorem to find a missing angle.
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• Critical Thinking

## Third Angle Theorem Discussion Questions

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A list of student-submitted discussion questions for Third Angle Theorem.
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• Real World Application

## Third Angle Theorem

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Who is better at parallel parking, men or women?
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• Study Guide

## Triangle Congruence Study Guide

by CK-12 //at grade
This study guide is an overview of triangle congruence: defining corresponding parts of congruent triangles, postulates and theorems for congruences (SSS, SAS, AAS, ASA), and postulates and theorems for congruences for special triangles.
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