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

This is a collection of definitions related to angles and related concepts. This includes general definitions for angles, angle measures, and angle properties, as well as specific angle types. Relationships among different types of angles are also defined.

This is a collection of definitions related to circles and related topics. This includes general definitions for parts of a circle, constructions involving circles, and other topics.

This is a collection of definitions related to circles and related topics. This includes general definitions for parts of a circle, constructions involving circles, and other topics.

This is a collection of definitions related to circles and related topics. This includes general definitions for parts of a circle, constructions involving circles, and other topics.

This collection of clip art images includes image sequences for key topics in geometry. This includes points, lines, planes, angles, triangles, quadrilaterals, and polygons. Each sequence of images provides an overview of the topic.

During Medieval times, castles were fortresses, mini-cities where the royalty lived, and symbols of power. Most castles were tall, imposing structures. But why were they so tall? Was it just for symbolic reasons, to allow a king to show his center of power and influence?

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

Use this math game to review circles. This is a Memory-style game in which students must remember the location of pairs of identical images.

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