Document Type

Lesson Plan

Publication Date



Students learned to construct polygons using Geometers Sketchpad. Using these constructions, students were able to infer the sum of the exterior angles of any polygon, the formula to find the sum of the interior angles of a polygon and the measure to each angle of any regular polygon. Students continued to explore polygons, this time considering their area with a constant perimeter restriction and how the area of a regular polygon relates to the area of a triangle inside the regular polygon which uses the center as a vertex.


Questions, comments or suggestions about this model may be sent to:
Dr. Leigh Little, The College at Brockport

PolygonsWithinOurWorldChallengeProject.ZIP (216 kB)
Contains lesson plan and any application files

Tools used

Geometer’s Sketch pad

Grade Level