Explore the structure and measurement of polygons.

[Free Registration/Login Required] This flipchart introduces fifth graders to the science of light. Principles such as transparent, translucent, opaque, reflection, and refraction are covered. Concave and convex mirrors and lenses are...

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...

Included here are illustrations of reflections from a plane mirror, a concave mirror and a convex mirror.

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

A simple activity to investigate how light reflects off a flat surface, a convex one, and a concave one. With a link to an article on reflection.

This site gives the general definition of a octagon with examples of regular convex and irregular concave octagons. The site has links to related terms, everyday examples, challenging problems, more information, and the interactive check...

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

This site provides an image of M.C. Escher's lithograph, "Convex and Concave," which can be enlarged by clicking on it. Included is a brief quote, "from the text of M.C. Escher - the Graphic Work," which provides some insight into...

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 article from Khan Academy provides information about mirrors. This information is intended for the Class 12 Physics Course (India).

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.] This concept teaches students how to classify a polygon based on its sides and how to determine whether a polygon is convex or concave.

This site gives the general definition of a nonagon with examples of a regular (convex) and irregular concave nonagons. There are links to related terms, challenging problems, more information, and the interactive check point involving...

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

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.