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# 45-45-90 Right Triangles

## Leg times sqrt(2) equals hypotenuse.

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

## 45-45-90 Right Triangles

by CK-12 //at grade

This concept teaches students about the 45-45-90 special right triangle and how to apply its properties.

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• Read

## 45-45-90 Triangles

by CK-12 //at grade

Recognize special right triangles and their properties

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• PLIX

## 45-45-90 Right Triangles: Baseball Diamond

by CK-12 //at grade

45-45-90 Right Triangles Interactive

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• Video

## 454590 Right Triangles Principles

by CK-12 //at grade

This video gives more detail about the mathematical principles presented in 454590 Right Triangles.

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• Video

## 454590 Right Triangles Examples

by CK-12 //at grade

This video shows how to work step-by-step through one or more of the examples in 454590 Right Triangles.

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• Downloadable Quiz

## 45-45-90 Right Triangles Quiz

by CK-12 //at grade

Ten question quiz. Students must solve for the missing sides of 45-45-90 triangles. Students must also find the area, perimeter, and length of the diagonals of squares using their knowledge of 45-45-90 triangles.

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• Practice
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## 45-45-90 Right Triangles Practice

by CK-12 //at grade
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• Critical Thinking

## 45-45-90 Right Triangles Discussion Questions

by CK-12 //at grade

A list of student-submitted discussion questions for 45-45-90 Right Triangles.

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• Pre Read

## 45-45-90 Right Triangles Pre Read

by CK-12 //at grade

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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• Post Read

## 45-45-90 Right Triangles Post Read

by CK-12 //at grade

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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• While Read

## 45-45-90 Right Triangles Stop and Jot Table

by CK-12 //at grade

Learn new vocabulary words and help remember them by coming up with your own sentences with the new words using a Stop and Jot table.

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• Post Read

## 45-45-90 Triangles

by CK-12 //at grade

Summarize the main idea of a reading, create visual aids, and come up with new questions using a Four Square Concept Matrix.

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• Real World Application

## Right Triangles

by CK-12 //at grade

Why should drug dealers study their geometry?

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• Real World Application

## Puzzling Triangles

by CK-12 //at grade

Learn about a popular puzzle game that is based on 45-45-90 triangles.

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• Study Guide

## Special Right Triangles Study Guide

by CK-12 //at grade

The special triangles 45-45-90, 30-60-90, and equilateral triangle are covered in this study guide.

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