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

In this video tutorial intersecting lines and planes are defined.

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

In this video tutorial parallel and perpendicular lines are defined.

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

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

In this video tutorial different types of angles are defined, including acute, right, supplementary, and straight angles.

In this video tutorial different types of angles are defined, including adjacent angles, complementary angles, supplementary angles, and

In this program we explore the properties of angles and planes. We do this in the context of two real-world applications.

The observatory in Arecibo, Puerto Rico provides astronomers insights into the structure of our solar system.

Himeji castle in Japan is a marvel of architecture and a startling example of geometry and military science.

In the Canadian Rockies, the Burgess Shale fossils provide a window to prehistoric Earth.

This is the Teacher's Guide that accompanies Geometry Applications: Angles and Planes.

This hands-on activity is a companion to the video segment from the Geometry Applications: Angles and Planes video. In particular, it supports the segment on the architecture of Himeji Castle.

This set of tutorials provides 48 examples of angles and how to identify angles by their measurement. NOTE: The download is a PPT file.

In this Slide Show, learn about the geometry of castle construction.

In this tutorial, learn what the Angle Addition Postulate is and how to use it to solve problems.

In this Math Riddles Game, have your students review vocabulary around the topic of angles.

This is part of a collection of clip art images showing different types of angles.

This is part of a collection of clip art images showing different types of angles.

This is part of a collection of clip art images showing different types of angles.

This is part of a collection of clip art images showing different types of angles.

This is part of a collection of clip art images showing different types of angles.

This is part of a collection of clip art images showing different types of angles.

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.