HSG-CO.C.11

Prove theorems about parallelograms. Theorems include: opposite sides are congruent, opposite angles are congruent, the diagonals of a parallelogram bisect each other, and conversely, rectangles are parallelograms with congruent diagonals.

 
42 Lesson(s)
   

Precious Parallelograms

Geometry » Unit: Pretty Polygons
Geometry » Unit: Pretty Polygons
Stephanie Conklin
Saratoga Springs, NY
Environment: Suburban
 
Big Idea:

Proofs + Parallelograms = Pretty Pairing! Students prove that opposite sides in a parallelogram are congruent and that opposite angles are also congruent.

 
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Resources (23)
 
Reflections (4)
tn parallelogram image
   

Finally Finals #1

Geometry » Unit: Finally Finals
Geometry » Unit: Finally Finals
Stephanie Conklin
Saratoga Springs, NY
Environment: Suburban
 
Big Idea:

It's time for Jeopardy! In this review lesson, students will play Jeopardy to review key topics covered in the Geometry curriculum like transformations and perpendicular bisectors.

 
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Resources (10)
final image
   

Shifty Shears

Geometry » Unit: Area Relationships
Geometry » Unit: Area Relationships
Tom Chandler
Ault, CO
Environment: Rural
 
Big Idea:

We use Cavalieri's Principle to analyze racing yacht sails, the face of a deck of cards, and shears...which are used in yet another transformation proof.

 
Resources (26)
shiftyshears image
   

Triangle Congruence and CPCTC Practice

Geometry » Unit: Discovering and Proving Triangle Properties
Geometry » Unit: Discovering and Proving Triangle Properties
Jessica Uy
Sunnyvale, CA
Environment: Suburban
 
Big Idea:

Through a kinesthetic menu activity, students will be able to use congruent triangles to write proofs about special triangles and quadrilaterals.

 
Favorites (11)
 
Resources (11)
playground equipment triangles
   

Proofs with Triangle Congruence Shortcuts

Geometry » Unit: Discovering and Proving Triangle Properties
Geometry » Unit: Discovering and Proving Triangle Properties
Jessica Uy
Sunnyvale, CA
Environment: Suburban
 
Big Idea:

In stations, students can choose to work individually or with a partner to prove properties of special triangles and parallelograms using triangle congruence shortcuts.

 
Favorites (3)
 
Resources (22)
 
Reflections (1)
cpctc
   

Investigating Special Quadrilaterals

Geometry » Unit: Introducing Geometry
Geometry » Unit: Introducing Geometry
Jessica Uy
Sunnyvale, CA
Environment: Suburban
 
Big Idea:

In this hands-on investigation, students will explore properties of special quadrilaterals and ultimately come up with a minimal defining list to differentiate them from one another.

 
Favorites (9)
 
Resources (19)
 
Reflections (2)
inv sp quad rotated li
   

Introducing Geometry Unit Assessment

Geometry » Unit: Introducing Geometry
Geometry » Unit: Introducing Geometry
Jessica Uy
Sunnyvale, CA
Environment: Suburban
 
Big Idea:

Students will get to see how they, as individuals, perform on the unit test.

 
Resources (10)
 
Reflections (1)
lesson image resized
   

Developing the Family Tree of Quadrilaterals

Geometry » Unit: Quadrilaterals
Geometry » Unit: Quadrilaterals
Beth Menzie
Amsterdam, NY
Environment: Urban
 
Big Idea:

What does the family tree look like for the quadrilaterals?

 
Favorites (10)
 
Resources (15)
 
Reflections (1)
image family tree of quadrilaterals resized
   

Presenting Polygons

Geometry » Unit: Pretty Polygons
Geometry » Unit: Pretty Polygons
Stephanie Conklin
Saratoga Springs, NY
Environment: Suburban
 
Big Idea:

Tri, Quad, Pent, Hex ... learn the key vocabulary for polygon shapes and find interior angle measure for these pretty polygons!

 
Favorites (9)
 
Resources (25)
 
Reflections (2)
polygons presenting polygons image resized
   

Introductory Investigation of Quadrilaterals

Geometry » Unit: Quadrilaterals
Geometry » Unit: Quadrilaterals
Beth Menzie
Amsterdam, NY
Environment: Urban
 
Big Idea:

Students familiarize themselves with quadrilaterals by using a ruler and protractor to investigate the characteristics that define each polygon.

 
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Resources (15)
 
Reflections (1)
quadrilateralsimage resized
   

Origami Cranes and Geometric Definitions

Geometry » Unit: Proofs about Parallelograms
Geometry » Unit: Proofs about Parallelograms
Marisa Laks
New York, NY
Environment: Urban
 
Big Idea:

Students explore theorems about parallelograms through a hands-on activity. By the end of the activity, students will have made an Origami Crane!

 
Favorites (3)
 
Resources (14)
 
Reflections (1)
origami crane image
   

Problem Solving with Quadrilaterals

Geometry » Unit: Quadrilaterals
Geometry » Unit: Quadrilaterals
Beth Menzie
Amsterdam, NY
Environment: Urban
 
Big Idea:

Students put their knowledge of quadrilaterals to work solving numerical and algebraic problems.

 
Favorites (5)
 
Resources (19)
 
Reflections (1)
problemsolvingimage resized
   

Quadrilateral Tangram Investigations

Geometry » Unit: Proofs about Parallelograms
Geometry » Unit: Proofs about Parallelograms
Marisa Laks
New York, NY
Environment: Urban
 
Big Idea:

This lesson is a pre-assessment to identify what the students know about the properties of quadrilaterals. They use tangrams to form shapes and write about what they discover.

 
Favorites (2)
 
Resources (16)
 
Reflections (1)
tangram quadrilateral investigations image
   

Interior and Exterior Angle Sum of Polygons

Geometry » Unit: Discovering and Proving Polygon Properties
Geometry » Unit: Discovering and Proving Polygon Properties
Jessica Uy
Sunnyvale, CA
Environment: Suburban
 
Big Idea:

Through investigating a variety of polygons with different numbers of sides, students will discover the interior and exterior angle sum for any polygon.

 
Favorites (7)
 
Resources (26)
 
Reflections (1)
student sample
   

Parallelograms in Action

Geometry » Unit: Pretty Polygons
Geometry » Unit: Pretty Polygons
Stephanie Conklin
Saratoga Springs, NY
Environment: Suburban
 
Big Idea:

Students persevere through challenging problems that use properties of parallelograms and derive characteristics of special cases of parallelograms like squares, rhombi and rectangles.

 
Favorites (5)
 
Resources (14)
parallelogram person parallelograms in action image
Common Core Math
 
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