# 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 //at grade
This concept teaches students about perpendicular lines.
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• PLIX

## Perpendicular Lines

by CK-12 //at grade
Perpendicular Lines Interactive
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• Video

## Perpendicular Lines Principles

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

## Perpendicular Lines Examples

by CK-12 //at grade
This video shows how to work step-by-step through one or more of the examples in Perpendicular Lines.
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• Critical Thinking

## Perpendicular Lines Discussion Questions

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

## Perpendicular Lines

by CK-12 //at grade
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

by CK-12 //at grade
Find out how builders and carpenters create perfectly perpendicular lines and square angles in their work.
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• Study Guide

## Lines and Angles Study Guide

by CK-12 //at grade
This study guide is an overview of notation and basic postulates/theorems for parallel and perpendicular lines.
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