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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.

This concept teaches students how to prove that a quadrilateral is a parallelogram given the properties of parallelograms.

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• PLIX

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• Video

## Quadrilaterals that are Parallelograms Principles

This video gives more detail about the mathematical principles presented in Quadrilaterals that are Parallelograms.

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• Video

## Quadrilaterals that are Parallelograms Examples

This video shows how to work step-by-step through one or more of the examples in Quadrilaterals that are Parallelograms.

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• Video

## Opposite Sides of a Parallelogram

Proves that a quadrilateral is a parallelogram if and only if the opposite sides are congruent.

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• Video

## Diagonals of a Parallelogram

Proves that a quadrilateral is a parallelogram if and only if its diagonals bisect each other.

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• Practice
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## Quadrilaterals that are Parallelograms Practice

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• Interactive Exercise

## Diagonal of a Parallelogram

Displays a parallelogram with one side length and asks for the diagonal length.

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• Critical Thinking

## Quadrilaterals that are Parallelograms Discussion Questions

A list of student-submitted discussion questions for Quadrilaterals that are Parallelograms.

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To emphasize students’ understanding of key words and practice applying the definitions of the vocabulary words to examples and drawings using the Frayer Model.

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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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## Quadrilaterals that are Parallelograms 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

How can squares feed the world?

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• Study Guide