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Area and Perimeter of Triangles

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

This concept teaches students to find the area and perimeter of triangles.

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Find the Dimensions and Area of Triangles

Use formulas and given information to figure out the dimensions and the area of different triangles.

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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 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