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# 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.
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## Perpendicular Lines

Perpendicular Lines Interactive

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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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## Perpendicular Lines Quiz

Ten question quiz. Students give a real world example of perpendicular lines. Identify perpendicular lines, right angles, and non-right angles in diagrams. Students solve for x in a right angle. Students determine if statements are true or false and give justification.

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• Practice
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## Perpendicular Lines Practice

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• Interactive Exercise

## Parallel, Perpendicular or Neither

Displays a graph of two lines. Decide whether the prompt is true or false.

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• Critical Thinking

## Perpendicular Lines Discussion Questions

A list of student-submitted discussion questions for Perpendicular Lines.

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To activate prior knowledge, to generate questions about a given topic, and to organize knowledge using a KWL Chart.

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To activate prior knowledge, to generate questions about a given topic, and to organize knowledge using a KWL Chart.

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## Perpendicular Lines Four Square

To stress understanding of a concept by summarizing the main idea and applying that understanding to create visual aids and generate questions and comments using a Concept Matrix.

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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

## Lines and Angles Study Guide

This study guide is an overview of notation and basic postulates/theorems for parallel and perpendicular lines.

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## Construct a Perpendicular to a Point

How to construct a perpendicular to a point NOT on a line using just a compass and a straightedge.

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## Construct a Perpendicular to a Point on a Line

How to construct a perpendicular to a point on a line using just a compass and a straightedge.

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