The following are two Geometer's Sketchpad Activities that allow you to explore the interior angle sum of polygons and the interior, exterior, and central angle measures of regular polygons.  Make sure to click and drag vertices to explore these properties and answer the questions on each activity!

Interior Angle Measures of Convex Polygons

Angle Measures of Regular Polygons

Note: You need to have GSP to open these files.  You do NOT need any prior experience to explore these activities!

Updated: 03/2/2004

Back to K-8 Mathematics Technology Projects

Want to learn more? Check out the following tutorials:
Getting Started with Geometer's Sketchpad: Drawing, Constructing and Moving Objects
Getting Started with Geometer's Sketchpad: Constructing, Labeling and Measuring Objects