## Prove theorems about lines and angles. Theorems include: vertical angles are congruent; when a transversal crosses parallel lines, alternate interior angles are congruent and corresponding angles are congruent; points on a perpendicular bisector of a line segment are exactly those equidistant from the segment's endpoints.

48 Lesson(s)

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

Big Idea:

#### Students will draw and measure to discover relationships of angles formed by parallel lines cut by a transversal.

Standards:

Favorites (21)

Resources (20)

Reflections (1)

Geometry » Unit: Transformations
Amsterdam, NY
Environment: Urban

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Favorites (15)

Resources (22)

Reflections (2)

### Parallel Lines Intersected by a Transversal

Geometry » Unit: Introduction to Geometric Proofs
Geometry » Unit: Introduction to Geometric Proofs
New York, NY
Environment: Urban

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Favorites (9)

Resources (20)

Reflections (3)

### Intersection Logic

Geometry » Unit: Dimension and Structure
Geometry » Unit: Dimension and Structure
Ault, CO
Environment: Rural

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Favorites (1)

Resources (28)

Reflections (2)

### Algebra and Angle Pairs

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

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Favorites (9)

Resources (16)

Reflections (1)

### Recyled Definitions

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

Big Idea:

#### Given a set of definitions, students will try to find counterexamples while applying their understanding of basic geometry vocabulary, particularly types of angles.

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Favorites (1)

Resources (9)

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

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Favorites (3)

Resources (19)

Reflections (2)

### Parallel Lines Challenge Problem

8th Grade Math » Unit: Transformations
8th Grade Math » Unit: Transformations
Bowling Green, KY
Environment: Suburban

Big Idea:

#### Challenge students to prove what they know about parallel lines and angle relationships when the diagram is unique and exact angle measures irrelevant.

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Favorites (3)

Resources (12)

Reflections (1)

Geometry » Unit: Introduction to Geometric Proofs
Geometry » Unit: Introduction to Geometric Proofs
New York, NY
Environment: Urban

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Favorites (7)

Resources (16)

Reflections (1)

### Proofs using Postulates

Geometry » Unit: Introduction to Geometric Proofs
Geometry » Unit: Introduction to Geometric Proofs
New York, NY
Environment: Urban

Big Idea:

#### Students will explore the equality postulates used in geometric proofs.

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Favorites (5)

Resources (17)

Reflections (1)

Geometry » Unit: Parallel Lines
Amsterdam, NY
Environment: Urban

Big Idea:

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Favorites (5)

Resources (24)

Reflections (1)

### Angle Chase Justification

Geometry » Unit: Discovering and Proving Angle Relationships
Geometry » Unit: Discovering and Proving Angle Relationships
Sunnyvale, CA
Environment: Suburban

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Favorites (7)

Resources (20)

### Proving It

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

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Favorites (8)

Resources (25)

Reflections (2)

### Angles of a Triangle

Geometry » Unit: Parallel Lines
Geometry » Unit: Parallel Lines
Amsterdam, NY
Environment: Urban

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Favorites (17)

Resources (23)

Reflections (1)

### Now Angles

Geometry » Unit: Introduction to Geometry: Points, Lines, Planes, and Angles
Geometry » Unit: Introduction to Geometry: Points, Lines, Planes, and Angles
Saratoga Springs, NY
Environment: Suburban

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Favorites (10)

Resources (18)

Reflections (1)
Common Core Math