## 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
Saratoga Springs, NY
Environment: Suburban

Big Idea:

Standards:

Favorites (9)

Resources (23)

Reflections (4)

### Finally Finals #1

Geometry » Unit: Finally Finals
Geometry » Unit: Finally Finals
Saratoga Springs, NY
Environment: Suburban

Big Idea:

Standards:

Favorites (7)

Resources (10)

### Shifty Shears

Geometry » Unit: Area Relationships
Geometry » Unit: Area Relationships
Ault, CO
Environment: Rural

Big Idea:

Standards:

Resources (26)

### Triangle Congruence and CPCTC Practice

Geometry » Unit: Discovering and Proving Triangle Properties
Geometry » Unit: Discovering and Proving Triangle Properties
Sunnyvale, CA
Environment: Suburban

Big Idea:

Standards:

Favorites (11)

Resources (11)

### Proofs with Triangle Congruence Shortcuts

Geometry » Unit: Discovering and Proving Triangle Properties
Geometry » Unit: Discovering and Proving Triangle Properties
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.

Standards:

Favorites (3)

Resources (22)

Reflections (1)

Geometry » Unit: Introducing Geometry
Geometry » Unit: Introducing Geometry
Sunnyvale, CA
Environment: Suburban

Big Idea:

Standards:

Favorites (13)

Resources (19)

Reflections (2)

### Introducing Geometry Unit Assessment

Geometry » Unit: Introducing Geometry
Geometry » Unit: Introducing Geometry
Sunnyvale, CA
Environment: Suburban

Big Idea:

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

Standards:

Resources (10)

Reflections (1)

Amsterdam, NY
Environment: Urban

Big Idea:

Standards:

Favorites (13)

Resources (15)

Reflections (1)

### Presenting Polygons

Geometry » Unit: Pretty Polygons
Geometry » Unit: Pretty Polygons
Saratoga Springs, NY
Environment: Suburban

Big Idea:

Standards:

Favorites (10)

Resources (25)

Reflections (2)

### Interior and Exterior Angle Sum of Polygons

Geometry » Unit: Discovering and Proving Polygon Properties
Geometry » Unit: Discovering and Proving Polygon Properties
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.

Standards:

Favorites (9)

Resources (26)

Reflections (1)

Amsterdam, NY
Environment: Urban

Big Idea:

Standards:

Favorites (9)

Resources (15)

Reflections (1)

### Origami Cranes and Geometric Definitions

Geometry » Unit: Proofs about Parallelograms
Geometry » Unit: Proofs about Parallelograms
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!

Standards:

Favorites (5)

Resources (14)

Reflections (1)

Geometry » Unit: Proofs about Parallelograms
Geometry » Unit: Proofs about Parallelograms
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.

Standards:

Favorites (2)

Resources (16)

Reflections (1)

Amsterdam, NY
Environment: Urban

Big Idea:

Standards:

Favorites (5)

Resources (19)

Reflections (1)

### Parallelograms in Action

Geometry » Unit: Pretty Polygons
Geometry » Unit: Pretty Polygons
Saratoga Springs, NY
Environment: Suburban

Big Idea:

Standards:

Favorites (5)

Resources (14)
Common Core Math