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

[Free Registration/Login Required] This flipchart defines a polygon and the classification of concave and convex polygons.

[Free Registration/Login may be required to access all resource tools.] In this lesson students find the measure of the exterior angles of a polygon. Students examine guided notes, review guided practice, watch instructional videos and...

Learn how to construct convex polygons and the mathematical foundations of symmetry on this site.

[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.

Explore the structure and measurement of polygons.

This is a question response page from the University of Regina where you will find an algorithm for finding the number of degrees of any convex polygon.

Explains the basic concept of polygons with examples.

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

This personal site presents some general information about polygons.

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.

This site provides definitions of different types of polygons and figures.

A comprehensive guide for learning all about concave shapes with definitions, the difference between concave and convex, examples, and practice questions.

Students discover properties of interior and exterior angles of convex polygons using the TI-89 and Geometer's Sketchpad.

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

This is a question response page from the University of Regina where you will find an algorithm for finding the number of degrees of any convex polygon.

This in-depth paper examines the idea of convexity. Euclid's Elements, the first geometry textbook, assumed convexity without mentioning the term.

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

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...

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...

Hotmath provides 21 practice problems dealing with systems of equations and inequalities. Each of the practice problems include a step-by-step guide for solving their algebraic problem.

This site from the University of California deals with different applications and topics pertaining to triangles, particularly triangulation.