# Perpendicular Lines

## Lines that intersect at 90 degree or right angles.

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.

## Perpendicular Lines

by CK-12 //basic
Use perpendicular line properties and theorems.
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## Perpendicular Lines

This concept teaches students about perpendicular lines.
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## Perpendicular Lines

This concept teaches students about perpendicular lines.
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## Perpendicular Lines

Use perpendicular line properties and theorems.
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## Line Properties

by Clothilde Labrousse //basic
Use perpendicular line properties and theorems.
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## Perpendicular Lines

This concept teaches students about perpendicular lines.
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• PLIX

## Perpendicular Lines

Perpendicular Lines Interactive
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• Video

## Perpendicular Lines Principles - Basic

by CK-12 //basic
This video provides the student with a walkthrough on perpendicular lines.
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• Video

## Perpendicular Lines Examples - Basic

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

## Perpendicular Lines Principles

This video gives more detail about the mathematical principles presented in Perpendicular Lines.
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• Video

## Perpendicular Lines Examples

This video shows how to work step-by-step through one or more of the examples in Perpendicular Lines.
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• Video

## Parallel and Perpendicular Lines and Planes

by CK-12 //basic
Defines and identifies parallel lines.
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• Video

## Perpendicular Line Postulate

by CK-12 //basic
What's the perpendicular line postulate and how do you construct a perpendicular line? Watch this video for the answers.
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• Critical Thinking

## Perpendicular Lines Discussion Questions

A list of student-submitted discussion questions for Perpendicular Lines.
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• Real World Application

## Perpendicular Lines

When playing the violin, why does your bow have to be at a right angle to the strings?
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• Real World Application

## Turning The Tables

Find out how builders and carpenters create perfectly perpendicular lines and square angles in their work.
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• Study Guide