Sixth graders find the perimeters of polygons and use perimeters to form polygons. In this perimeter instructional activity, 6th graders study vocabulary associated with finding perimeter such as polygon, line segment, variable, and...

Students calculate the sum of the angles of a polygon. In this geometry lesson plan, students use the interior angle formula of polygon based on the number of sides of the polygon. They identify the missing angle using algebra.

This site from the University of California, Berkeley, provides a description of the life of Francois Viete, along with information about his works and his construction of a regular heptagon.