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.