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# Quadrilaterals that are Parallelograms

## Ways to show if a quadrilateral has two pairs of parallel sides.

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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.

## Quadrilaterals that are Parallelograms

by CK-12 //basic
Prove a quadrilateral is a parallelogram.
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## Quadrilaterals that are Parallelograms

by CK-12 //at grade
This concept teaches students how to prove that a quadrilateral is a parallelogram given the properties of parallelograms.
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## Quadrilaterals that are Parallelograms Workbook

by Dawn Sterzinger //at grade
This concept teaches students how to prove that a quadrilateral is a parallelogram given the properties of parallelograms.
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• PLIX

## Quadrilaterals that are Parallelograms

by CK-12 //at grade
Quadrilaterals that are Parallelograms Interactive
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• Video

## Quadrilaterals that are Parallelograms Principles

by CK-12 //at grade
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

by CK-12 //at grade
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

## Proving a Quadrilateral is a Parallelogram Principles - Basic

by CK-12 //basic
This video provides the student with a walkthrough on proving that a quadrilateral is a parallelogram.
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• Video

## Proving a Quadrilateral is a Parallelogram Examples - Basic

by CK-12 //basic
This video provides the student with a walkthrough of one or more examples from the concept "Proving a Quadrilateral is a Parallelogram".
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• Video

## Opposite Sides of a Parallelogram

by CK-12 //at grade
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

by CK-12 //at grade
Proves that a quadrilateral is a parallelogram if and only if its diagonals bisect each other.
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• 1
• Critical Thinking

## Quadrilaterals that are Parallelograms Discussion Questions

by CK-12 //at grade
A list of student-submitted discussion questions for Quadrilaterals that are Parallelograms.
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• Real World Application

## Quadrilaterals That Are Parallelograms

by CK-12 //at grade
How can squares feed the world?
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• Study Guide

## Parallelograms Study Guide

by CK-12 //at grade
This study guide looks at properties of parallelograms and special parallelograms (rectangle, rhombus, square), theorems about parallelograms and special parallelograms, and how to identify special parallelograms.
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