## G.GCO.8 - Prove, and apply in mathematical and real-world contexts, theorems about lines and angles, including the following: a. vertical angles are congruent; b. when a transversal crosses parallel lines, alternate interior angles are congruent, alternate exterior angles are congruent, and consecutive interior angles are supplementary; c. any point on a perpendicular bisector of a line segment is equidistant from the endpoints of the segment; d. perpendicular lines form four right angles.

### Displaying 1 - 50 of 56 resources:

Thumbnail Image Title Description Curriculum Nodes

### Interactive Media Collection: Parallel Lines

This collection aggregates all the math videos and other resources on the topic of Parallel Lines. There are 13 resources.  Point-Slope Form, Slope-Intercept Form, Parallel Lines, Slope, Definition of a Quadrilateral and Perpendicular Lines

### Closed Captioned Video: Desmos Geometry Exploration: Intersecting Lines and Planes

Closed Captioned Video: Desmos Geometry Exploration: Intersecting Lines and Planes

In this video tutorial intersecting lines and planes are defined.

Definition of a Line

### Closed Captioned Video: Desmos Geometry Exploration: Lines, Rays, Segments

Closed Captioned Video: Desmos Geometry Exploration: Lines, Rays, Segments

In this video tutorial lines, rays, and segments are defined.

Definition of a Line

### Closed Captioned Video: Desmos Geometry Exploration: Parallel and Perpendicular Lines

Closed Captioned Video: Desmos Geometry Exploration: Parallel and Perpendicular Lines

In this video tutorial parallel and perpendicular lines are defined.

Parallel Lines and Perpendicular Lines

### Closed Captioned Video: Desmos Geometry Exploration: Planes

Closed Captioned Video: Desmos Geometry Exploration: Planes

In this video tutorial planes planes and coplanar points and lines are defined.

Definition of a Plane

### Closed Captioned Video: Desmos Geometry Exploration: Points

Closed Captioned Video: Desmos Geometry Exploration: Points

In this video tutorial points are defined. Students are shown how to construct and label points using the Desmos geometry tools.

Definition of an Angle

### Definition--Geometry Basics--Biconditional Statement

Definition--Geometry Basics--Biconditional Statement

This collection of clip art images includes image sequences for key topics in geometry.

Definition of a Point

### Definition--Geometry Basics--Conditional Statement

Definition--Geometry Basics--Conditional Statement

This collection of clip art images includes image sequences for key topics in geometry.

Definition of a Point

### Definition--Geometry Basics--Contrapositive Statement

Definition--Geometry Basics--Contrapositive Statement

This collection of clip art images includes image sequences for key topics in geometry.

Definition of a Point

### Definition--Geometry Basics--Inverse Statement

Definition--Geometry Basics--Inverse Statement

This collection of clip art images includes image sequences for key topics in geometry.

Definition of a Point

### 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.

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.

Perpendicular Lines, Parallel Lines and Applications of Points and Lines

### INSTRUCTIONAL RESOURCE: Nspire App Tutorial: The Perpendicular Bisectors of a Triangle

In this Slide Show, we show how to construct the perpendicular bisectors of the three sides of a triangle to show they intersect at a single point. This presentation requires the use of the TI-Nspire iPad App. Note: the download is a PPT.

Definition of a Triangle and Geometric Constructions with Triangles

### Math Clip Art: Parallel Lines Cut by a Transversal 1

Math Clip Art | Parallel Lines Cut by a Transversal 1

This collection of clip art images show the various angles formed by two parallel lines cut by a transversal.

Parallel Lines

### Math Clip Art: Parallel Lines Cut by a Transversal 10

Math Clip Art: Parallel Lines Cut by a Transversal 10

This collection of clip art images show the various angles formed by two parallel lines cut by a transversal.

Parallel Lines

### Math Clip Art: Parallel Lines Cut by a Transversal 11

Math Clip Art: Parallel Lines Cut by a Transversal 11

This collection of clip art images show the various angles formed by two parallel lines cut by a transversal.

Parallel Lines

### Math Clip Art: Parallel Lines Cut by a Transversal 12

Math Clip Art: Parallel Lines Cut by a Transversal 12

This collection of clip art images show the various angles formed by two parallel lines cut by a transversal.

Parallel Lines

### Math Clip Art: Parallel Lines Cut by a Transversal 13

Math Clip Art: Parallel Lines Cut by a Transversal 13

This collection of clip art images show the various angles formed by two parallel lines cut by a transversal.

Parallel Lines

### Math Clip Art: Parallel Lines Cut by a Transversal 14

Math Clip Art: Parallel Lines Cut by a Transversal 14

This collection of clip art images show the various angles formed by two parallel lines cut by a transversal.

Parallel Lines

### Math Clip Art: Parallel Lines Cut by a Transversal 15

Math Clip Art: Parallel Lines Cut by a Transversal 15

This collection of clip art images show the various angles formed by two parallel lines cut by a transversal.

Parallel Lines

### Math Clip Art: Parallel Lines Cut by a Transversal 16

Math Clip Art: Parallel Lines Cut by a Transversal 16

This collection of clip art images show the various angles formed by two parallel lines cut by a transversal.

Parallel Lines

### Math Clip Art: Parallel Lines Cut by a Transversal 17

Math Clip Art: Parallel Lines Cut by a Transversal 17

This collection of clip art images show the various angles formed by two parallel lines cut by a transversal.

Parallel Lines

### Math Clip Art: Parallel Lines Cut by a Transversal 18

Math Clip Art: Parallel Lines Cut by a Transversal 18

This collection of clip art images show the various angles formed by two parallel lines cut by a transversal.

Parallel Lines

### Math Clip Art: Parallel Lines Cut by a Transversal 19

Math Clip Art: Parallel Lines Cut by a Transversal 19

This collection of clip art images show the various angles formed by two parallel lines cut by a transversal.

Parallel Lines

### Math Clip Art: Parallel Lines Cut by a Transversal 2

Math Clip Art: Parallel Lines Cut by a Transversal 2

This collection of clip art images show the various angles formed by two parallel lines cut by a transversal.

Parallel Lines

### Math Clip Art: Parallel Lines Cut by a Transversal 20

Math Clip Art: Parallel Lines Cut by a Transversal 20

This collection of clip art images show the various angles formed by two parallel lines cut by a transversal.

Parallel Lines

### Math Clip Art: Parallel Lines Cut by a Transversal 3

Math Clip Art: Parallel Lines Cut by a Transversal 3

This collection of clip art images show the various angles formed by two parallel lines cut by a transversal.

Parallel Lines

### Math Clip Art: Parallel Lines Cut by a Transversal 4

Math Clip Art: Parallel Lines Cut by a Transversal 4

This collection of clip art images show the various angles formed by two parallel lines cut by a transversal.

Parallel Lines

### Math Clip Art: Parallel Lines Cut by a Transversal 5

Math Clip Art: Parallel Lines Cut by a Transversal 5

This collection of clip art images show the various angles formed by two parallel lines cut by a transversal.

Parallel Lines

### Math Clip Art: Parallel Lines Cut by a Transversal 6

Math Clip Art: Parallel Lines Cut by a Transversal 6

This collection of clip art images show the various angles formed by two parallel lines cut by a transversal.

Parallel Lines

### Math Clip Art: Parallel Lines Cut by a Transversal 7

Math Clip Art: Parallel Lines Cut by a Transversal 7

This collection of clip art images show the various angles formed by two parallel lines cut by a transversal.

Parallel Lines

### Math Clip Art: Parallel Lines Cut by a Transversal 8

<h1>Math Clip Art: Parallel Lines Cut by a Transversal 8</h1><p>

Parallel Lines

### Math Clip Art: Parallel Lines Cut by a Transversal 9

Math Clip Art: Parallel Lines Cut by a Transversal 9

This collection of clip art images show the various angles formed by two parallel lines cut by a transversal.

Parallel Lines

### Math Example--Geometric Proofs--Example 1

Math Example--Geometric Proofs--Example 1

This is part of a collection of math examples that focus on geometric proofs.

Parallel Lines and Definition of a Triangle

### Math Example--Geometric Proofs--Example 10

Math Example--Geometric Proofs--Example 10

This is part of a collection of math examples that focus on geometric proofs.

Parallel Lines and Definition of a Triangle

### Math Example--Geometric Proofs--Example 11

Math Example--Geometric Proofs--Example 11

This is part of a collection of math examples that focus on geometric proofs.

Parallel Lines and Definition of a Triangle

### Math Example--Geometric Proofs--Example 12

Math Example--Geometric Proofs--Example 12

This is part of a collection of math examples that focus on geometric proofs.

Parallel Lines and Definition of a Triangle

### Math Example--Geometric Proofs--Example 13

Math Example--Geometric Proofs--Example 13

This is part of a collection of math examples that focus on geometric proofs.

Parallel Lines and Definition of a Triangle

### Math Example--Geometric Proofs--Example 2

Math Example--Geometric Proofs--Example 2

This is part of a collection of math examples that focus on geometric proofs.

Parallel Lines and Definition of a Triangle

### Math Example--Geometric Proofs--Example 3

Math Example--Geometric Proofs--Example 3

This is part of a collection of math examples that focus on geometric proofs.

Parallel Lines and Definition of a Triangle

### Math Example--Geometric Proofs--Example 4

Math Example--Geometric Proofs--Example 4

This is part of a collection of math examples that focus on geometric proofs.

Parallel Lines and Definition of a Triangle

### Math Example--Geometric Proofs--Example 5

Math Example--Geometric Proofs--Example 5

This is part of a collection of math examples that focus on geometric proofs.

Parallel Lines and Definition of a Triangle

### Math Example--Geometric Proofs--Example 6

Math Example--Geometric Proofs--Example 6

This is part of a collection of math examples that focus on geometric proofs.

Parallel Lines and Definition of a Triangle

### Math Example--Geometric Proofs--Example 7

Math Example--Geometric Proofs--Example 7

This is part of a collection of math examples that focus on geometric proofs.

Parallel Lines and Definition of a Triangle

### Math Example--Geometric Proofs--Example 8

Math Example--Geometric Proofs--Example 8

This is part of a collection of math examples that focus on geometric proofs.

Parallel Lines and Definition of a Triangle

### Math Example--Geometric Proofs--Example 9

Math Example--Geometric Proofs--Example 9

This is part of a collection of math examples that focus on geometric proofs.

Parallel Lines and Definition of a Triangle

### Video Transcript: Desmos Geometry Exploration: Intersecting Lines and Planes

Video Transcript: Desmos Geometry Exploration: Intersecting Lines and Planes

This is the transcript for the video entitled, Desmos Geometry Exploration: Intersecting Lines and Planes.

Definition of a Line

### Video Transcript: Desmos Geometry Exploration: Lines, Rays, Segments

Video Transcript: Desmos Geometry Exploration: Lines, Rays, Segments

This is the transcript for the video entitled, Desmos Geometry Exploration: Lines, Rays, Segments.

Definition of a Line

### Video Transcript: Desmos Geometry Exploration: Parallel and Perpendicular Lines

Video Transcript: Desmos Geometry Exploration: Parallel and Perpendicular Lines

This is the transcript for the video entitled, Desmos Geometry Exploration: Parallel and Perpendicular Lines.

Parallel Lines and Perpendicular Lines

### Video Transcript: Desmos Geometry Exploration: Planes

Video Transcript: Desmos Geometry Exploration: Planes

This is the transcript for the video entitled, Desmos Geometry Exploration: Planes.

Definition of a Plane