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# Area and Perimeter of Triangles

## Area is half the base times the height while the perimeter is the sum of the sides.

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.

## Area and Perimeter of Triangles

by CK-12 //basic

Calculate the area and perimeter of a triangle.

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## Find the Dimensions and Area of Triangles

Learn to find the dimensions and area of triangles.

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## Area or Perimeter of Triangles and Quadrilaterals

Derive and use the formulas for area and perimeter of triangles and quadrilaterals.

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## Proofs with "Corresponding Parts of Congruent Triangles are Congruent"

by Scott Lamie //

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• PLIX

## Area and Perimeter of Triangles

Area and Perimeter of Triangles Interactive

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• PLIX

## Area and Perimeter of Triangles

Area and Perimeter of Triangles Interactive

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• Video

## Area of a Triangle (Whole Numbers)

by CK-12 //basic

Provides an example of how to determine the area of a triangle using whole numbers.

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• Video

## Area and Perimeter of Triangles Principles - Basic

by CK-12 //basic

This video provides the student with a walkthrough on finding area and perimeter of triangles.

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• Video

## Area and Perimeter of Triangles Examples - Basic

by CK-12 //basic

This video provides the student with a walkthrough of one or more examples from the concept "Area and Perimeter of Triangles".

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• Video

## Area and Perimeter of Triangles Principles

This video gives more detail about the mathematical principles presented in Area and Perimeter of Triangles.

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• Video

## Area and Perimeter of Triangles Examples

This video shows how to work step-by-step through one or more of the examples in Area and Perimeter of Triangles.

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## Area and Perimeter of Triangles Quiz

Nine question quiz. Students must solve for the area, perimeter, and missing sides of triangles.

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• Interactive Exercise

## Find the Perimeter of this Polygon

A polygon and a side length is given. Determine the perimeter.

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• Interactive Exercise

## Perimeter of Equilateral Triangle ABC

Presents details about the side lengths of an equilateral triangle and asks the perimeter.

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• Interactive Exercise

## What is Perimeter?

Checks your understanding of what perimeter means.

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• Interactive Exercise

## What is Area?

Checks your understanding of what area means.

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• Practice
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## Area and Perimeter of Triangles Practice

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• Interactive Exercise

## What is the area of a triangle?

Checks your understanding of what the area of a triangle is.

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• Interactive Exercise

## What is the area of a rectangle?

Checks your understanding of what the area of a rectangle is.

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• Interactive Exercise

## How does the Perimeter or Area Change?

Checks your understanding of similar triangles.

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• Interactive Exercise

## How does the Perimeter or Area Change (part 2)?

Checks your understanding of how perimeter and area change when a figure gets scaled.

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• Interactive Exercise

## Side Length of Equilateral Triangle ABC

Presents details about the side lengths of an equilateral triangle and asks the perimeter.

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• Critical Thinking

## Area and Perimeter of Triangles Discussion Questions

A list of student-submitted discussion questions for Area and Perimeter of Triangles.

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## Area and Perimeter of Triangles Pre Read

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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## Area and Perimeter of Triangles Post Read

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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## Area and Perimeter of Triangles KWL Chart

With this KWL Chart, reflect on your prior knowledge of a concept, come up with questions you’re curious about, and come up with answers from the reading.

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• Real World Application

## Fly Free!

Find out how triangles are incorporated into the design of hang gliders.

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• Real World Application

## Perimeter

How would you use perimeter and area in designing a scooter race track?

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• Study Guide

## Triangles and Quadrilaterals Study Guide

This study guide reviews the formulas for the perimeter and area of triangles and different types of quadrilaterals.

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## Triangle Explorer

by Kyle Bardman //basic

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## Area and Perimeter

by Kyle Bardman //basic

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• Flashcards

## Perimeter and Areas of Quadrilaterals Flashcards

by CK-12 //basic

These flashcards help you study important terms and vocabulary from the concepts on the area and perimeter of rectangles, parallelorams, triangles, trapezoids, rhombuses, kites, similar polygons, and composite shapes.

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• Flashcards

## Find the Dimensions and Area of Triangles

by Ellaine Chou //basic