## MAFS.8.G.1.5: Use informal arguments to establish facts about the angle sum and exterior angle of triangles, about the angles created when parallel lines are cut by a transversal, and the angle-angle criterion for similarity of triangles. For example, arrange three copies of the same triangle so that the sum of the three angles appears to form a line, and give an argument in terms of transversals why this is so.

There are 88 resources.
Title Description Thumbnail Image Curriculum Topics

Parallel Lines

Parallel Lines

Parallel Lines

Parallel Lines

Parallel Lines

Parallel Lines

Parallel Lines

Parallel Lines

## Collections in a Box: Parallel and Perpendicular Lines

### This cheat sheet gathers together the resources on the topic of parallel and perpendicular lines. See the descriptions and links below. Each link takes you to a collection of resources around that topic. The middle column indicates the number of resources available and the third column takes you to page on Media4Math where those resources can be found.

Geometric Constructions with Points and Lines, Parallel Lines, Perpendicular Lines

## Definition--Theorems and Postulates--Exterior Angle Theorem

### Definition--Theorems and Postulates--Exterior Angle Theorem This is part of a collection of definitions of geometric theorems and postulates.

Definition of a Triangle

## Google Earth Voyager Story: The Geometry of City Planning, Part 1

### Google Earth Voyager Story: The Geometry of City Planning, Part 1 In this activity, learn about the geometry of city planning. We explore why many cities in the US and around the world are laid out in a rectangular grid made up of parallel and perpendicular lines.

Perpendicular Lines, Parallel Lines

## Google Earth Voyager Story: The Geometry of City Planning, Part 2

### Google Earth Voyager Story: The Geometry of City Planning, Part 2 In this activity, learn about the geometry of city planning. We explore why many cities in the US and around the world are laid out in a rectangular grid made up of parallel and perpendicular lines.

Perpendicular Lines, Parallel Lines, Applications of Points and Lines

## Math Clip Art--Angle Illustrations--Adjacent Angles--Labeled

### Math Clip Art--Angle Illustrations--Adjacent Angles--Labeled This is part of a collection of clip art images showing different types of angles. Each type of angle measure includes a labeled and unlabeled version.

Angles, Applications of Angles and Planes

## Math Clip Art--Angle Illustrations--Adjacent Angles--Unlabeled

### Math Clip Art--Angle Illustrations--Adjacent Angles--Unlabeled This is part of a collection of clip art images showing different types of angles. Each type of angle measure includes a labeled and unlabeled version.

Angles, Applications of Angles and Planes

## Math Clip Art--Angle Illustrations--Complementary Angles--Labeled

### Math Clip Art--Angle Illustrations--Complementary Angles--Labeled This is part of a collection of clip art images showing different types of angles. Each type of angle measure includes a labeled and unlabeled version.

Angles, Applications of Angles and Planes

## Math Clip Art--Angle Illustrations--Complementary Angles--Unlabeled

### Math Clip Art--Angle Illustrations--Complementary Angles--Unlabeled This is part of a collection of clip art images showing different types of angles. Each type of angle measure includes a labeled and unlabeled version.

Angles, Applications of Angles and Planes

## Math Clip Art--Angle Illustrations--Supplementary Angles--Labeled

### Math Clip Art--Angle Illustrations--Supplementary Angles--Labeled This is part of a collection of clip art images showing different types of angles. Each type of angle measure includes a labeled and unlabeled version.

Angles, Applications of Angles and Planes

## Math Clip Art--Angle Illustrations--Supplementary Angles--Unlabeled

### Math Clip Art--Angle Illustrations--Supplementary Angles--Unlabeled This is part of a collection of clip art images showing different types of angles. Each type of angle measure includes a labeled and unlabeled version.

Angles, Applications of Angles and Planes

## Math Clip Art--Angle Illustrations--Vertical Angles--Labeled

### Math Clip Art--Angle Illustrations--Vertical Angles--Labeled This is part of a collection of clip art images showing different types of angles. Each type of angle measure includes a labeled and unlabeled version.

Angles, Applications of Angles and Planes

## Math Clip Art--Angle Illustrations--Vertical Angles--Unlabeled

### Math Clip Art--Angle Illustrations--Vertical Angles--Unlabeled This is part of a collection of clip art images showing different types of angles. Each type of angle measure includes a labeled and unlabeled version.

Angles, Applications of Angles and Planes

Parallel Lines

Parallel Lines

Parallel Lines

Parallel Lines