## Prove the slope criteria for parallel and perpendicular lines and use them to solve geometric problems (e.g., find the equation of a line parallel or perpendicular to a given line that passes through a given point).

19 Lesson(s)

### Line It Up!

Geometry » Unit: Line-sanity!
Geometry » Unit: Line-sanity!
Saratoga Springs, NY
Environment: Suburban

Big Idea:

#### In this student-centered lesson, students work together to construct parallel and perpendicular lines while also writing equations for these lines.

Standards:

Favorites (6)

Resources (39)

Reflections (5)

Algebra I » Unit: Graphing Linear Functions
Washington, DC
Environment: Urban

Big Idea:

#### Students will connect the main ideas from the previous four lessons to write the equations of parallel and perpendicular lines using given information.

Standards:

Favorites (31)

Resources (17)

Reflections (2)

Algebra I » Unit: Linear Functions
Rogers, AR
Environment: Rural

Big Idea:

#### Students reason about Perpendicular Lines with simple concrete examples using Geoboards and extend their reasoning to designing parking lines.

Standards:

Favorites (2)

Resources (17)

Reflections (1)

Geometry » Unit: Tools of Geometry
Amsterdam, NY
Environment: Urban

Big Idea:

#### Test time! Students take the first unit assessment, aligned to the Common Core standards for this unit.

Standards:

Favorites (8)

Resources (13)

Algebra I » Unit: Linear Functions
Rogers, AR
Environment: Rural

Big Idea:

Standards:

Favorites (1)

Resources (12)

### Why are lines parallel?

Algebra I » Unit: Linear Functions
Algebra I » Unit: Linear Functions
Rogers, AR
Environment: Rural

Big Idea:

#### The emphasis in this lesson is that students not only know the definition of parallel lines, but why lines are parallel.

Standards:

Resources (9)

Algebra I » Unit: Graphing Linear Functions
Washington, DC
Environment: Urban

Big Idea:

#### Through graphing students will deduce that the slopes of parallel lines are the same and the slopes of perpendicular lines are opposite reciprocals.

Standards:

Favorites (24)

Resources (16)

Reflections (2)

Geometry » Unit: Coordinate Geometry
Amsterdam, NY
Environment: Urban

Big Idea:

#### Test time! Students review and then take the unit assessment, hopefully demonstrating their knowledge of coordinate geometry, as well as their ability to organize and justify their work.

Standards:

Favorites (5)

Resources (14)

Geometry » Unit: Coordinate Geometry
Amsterdam, NY
Environment: Urban

Big Idea:

Standards:

Favorites (3)

Resources (9)

### Review Day

Algebra I » Unit: Graphing Linear Functions
Algebra I » Unit: Graphing Linear Functions
Washington, DC
Environment: Urban

Big Idea:

#### Students will complete review questions from the current unit as well as practice their pacing when answering assessment questions.

Standards:

Favorites (7)

Resources (16)

Reflections (1)

Geometry » Unit: Line-sanity!
Saratoga Springs, NY
Environment: Suburban

Big Idea:

Standards:

Favorites (1)

Resources (22)

Reflections (2)

### Perp Lines are Perfect

Geometry » Unit: Line-sanity!
Geometry » Unit: Line-sanity!
Saratoga Springs, NY
Environment: Suburban

Big Idea:

Standards:

Favorites (1)

Resources (23)

Reflections (2)

### Review for MidTerm

Geometry » Unit: MidTerm Materials
Geometry » Unit: MidTerm Materials
Saratoga Springs, NY
Environment: Suburban

Big Idea:

#### Around the world time! Students will travel around the classroom to review and then present their review questions to each other for review!

Standards:

Favorites (2)

Resources (14)

Reflections (2)

Geometry » Unit: Coordinate Geometry
Amsterdam, NY
Environment: Urban

Big Idea:

#### What is a strategic use of tools? Let's use dynamic software to deepen our students' understanding of coordinate geometry!

Standards:

Favorites (3)

Resources (20)

Reflections (2)

Geometry » Unit: Line-sanity!
Saratoga Springs, NY
Environment: Suburban

Big Idea:

Standards:

Resources (8)

Reflections (1)
Common Core Math