## 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 98 resources.
Title Description Thumbnail Image Curriculum Topics

## Math Examples Collection: Equations with Angles from Parallel Lines Cut by a Transversal

Parallel Lines, Applications of Angles and Planes and Applications of Equations and Inequalities

## Test Prep Interactive Quizzes

Addition Facts to 10, Addition Facts to 25, Addition Facts to 100, Place Value, Subtraction Facts to 100, Definition of an Angle, Solving One-Step Equations, Graphs of Linear Functions, Slope, Slope-Intercept Form and Counting

## Math Examples Collection: Equations with Angle Measures

Solving Multistep Equations, Applications of Angles and Planes and Applications of Quadrilaterals

## Math Clip Art Collection: Angles

### Overview

Angles and Applications of Angles and Planes

Parallel Lines

## Math Clip Art Collection: Points, Lines, Segments, and Rays

### <

Applications of Points and Lines, Parallel Lines, Perpendicular Lines, Applications of Coordinate Geometry and Coordinate Systems

## Math Definitions Collection: Geometry Theorems and Postulates

### O

Definition of a Triangle, Definition of an Angle, Right Triangles and Definition of a Line

## Math Clip Art Collection: Animated Clip Art

Definition of an Angle, Solving One-Step Equations, Time, Parallel Lines and Definition of a Triangle

## Math Examples Collection: Equations Using the Exterior Angle Theorem

Applications of Triangles

### Overview

Perpendicular Lines, Parallel Lines, Applications of Points and Lines, Applications of Circles, Cylinders, Applications of Angles and Planes, Applications of Polygons, Pyramids, Triangular Prisms, Rectangular Prisms, 3-Dimensional Figures, Applications of Surface Area and Volume, Rational Functions and Equations, Surface Area, Volume, Applications of Triangles and Applications of Quadrilaterals

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 and 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 and 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 and 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 and 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 and Applications of Angles and Planes