Polygons for kids. Learn how they work, terms, tricks and examples. Regular, convex, concave, complex, and more.

Illustrated diagrams in this tutorial help students understand the properties and functions of lenses.

This website, from the University of Edinburgh, provides a lengthy glossary of computer graphics terms written by Olin Lathrop, author of "The Way Computer Graphics Work". This site provides simple definitions of basic terms; no graphics...

A physics tutorial focused on the behavior of light as it relates to concave mirrors.

A complete reference guide to irregular polygons. It provides definitions and an interactive activity that enhances further explanation. Includes links to related topics.

A complete reference guide to regular polygons. It provides definitions, examples, and an interactive activity that enhances further explanation. Includes links to related topics.

Explore the structure and measurement of polygons.

Site describes how to construct a telescope and what you can do with it. Also provides a simple explanation of how telescopes work.

Several short descriptions of demonstrations which illustrate principles of geometric optics (many of which focus upon refraction).

This website has basic definitions for most polygons, regular and irregular.

This personal site presents some general information about polygons.

This lesson will describe what a lens is and how a lens works.

This lesson will give an overview on how mirrors work.

Explains the basic concept of polygons with examples.

This picture is of a tangram puzzle. Tangram puzzles feature 7 pieces which can be put together to form a variety of shapes. It was invented in China before making its way to Europe and the rest of the world. Including the shape below it...

The model of these cymbals is visibly different from other models. The rims of these cymbals are relatively larger and the central calotte is less convex than that of other instruments, which is the reason they produce a muffled sound.

The black varnished wood shrine has a convex roof that slopes away toward the back to resemble the Predynastic temples of southern Egypt. It originally contained two snake statues on a standard.

The dynamics of shape in art and the relationship of shape with the other elements of art. The effects of angles and lines on perception.

This site provides a very brief definition to geometric optics, and includes links to related information.

This site provides a definition for plane figure (at the top of the page) and a few examples.

[Free Registration/Login may be required to access all resource tools.] Find interior angle measures of polygons by drawing diagonals to create triangles.

An image of Daniel Keyes.