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# Alternate Interior Angles

## Angles on opposite sides of a transversal, but inside the lines it intersects.

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.
• Read

## Alternate Interior Angles

by CK-12 //basic
Use alternate interior angles to determine angle congruency and the presence of parallel lines.
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• Read

## Alternate Interior Angles

by CK-12 //at grade
This concept introduces students to alternate interior angles and how to use them to determine whether or not lines are parallel.
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• Read

## Alternate Interior Angles

by Math Writing Team //at grade
Use alternate interior angles to determine angle congruency and the presence of parallel lines.
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• Read

## Alternate Interior Angles

by Christine Zadylak //basic
Use alternate interior angles to determine angle congruency and the presence of parallel lines.
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• Read

## Alternate Interior Angles

by Susan Sudberry //basic
Use alternate interior angles to determine angle congruency and the presence of parallel lines.
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0
• Read

## Alternate Interior Angles

by Kisha Barnes //basic
Use alternate interior angles to determine angle congruency and the presence of parallel lines.
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• PLIX

## Alternate Interior Angles

by CK-12 //at grade
Alternate Interior Angles Interactive
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• Video

## Alternate Interior Angles Principles - Basic

by CK-12 //basic
This video provides the student with a walkthrough on alternate interior angles.
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• Video

## Alternate Interior Angles Examples - Basic

by CK-12 //basic
This video provides the student with a walkthrough of one or more examples from the concept "Alternate Interior Angles".
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• Video

## Alternate Interior Angles Principles

by CK-12 //at grade
This video gives more detail about the mathematical principles presented in Alternate Interior Angles.
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• Video

## Alternate Interior Angles Examples

by CK-12 //at grade
This video shows how to work step-by-step through one or more of the examples in Alternate Interior Angles.
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• Video

## Angles and Transversals

by CK-12 //advanced
Learn about transversals and the angles made by transversals.
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• Video

## Proof: Alternate Interior Angles Are Congruent

by CK-12 //basic
Take a look at this proof that shows that alternate interior angles are congruent!
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• Video

## Proof: Alternate Interior Angles Converse

by CK-12 //basic
Take a look at this proof that shows the alternate interior angles converse.
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• Downloadable Quiz

## Alternate Interior Angles Quiz

by CK-12 //at grade
Eleven question quiz. Students need to identify alternate interior angles and justify that they are in fact alternate interior angles. Students will solve for missing alternate interior angles using simple arithmetic and algebraically.
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• 3
• Critical Thinking

## Alternate Interior Angles Discussion Questions

by CK-12 //at grade
A list of student-submitted discussion questions for Alternate Interior Angles.
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• Real World Application

## Alternate Interior Angles

by CK-12 //at grade
How did Eratosthenes use alternate interior angles to prove the earth is round?
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• Real World Application

## Alternate Interior Angles

by Audrey //at grade
How did Eratosthenes use alternate interior angles to prove the earth is round?
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• Study Guide

## Angles and Transversals Study Guide

by CK-12 //at grade
This study guide reviews angles formed by transversals and postulates and theorems of parallel and perpendicular lines.
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