Heptagon and Heptagrams / Septegram.
Proposed Problem 63: Heptagon
Regular, Side and Diagonals.
Origami: How to make a Heptagon from a circle.
Origami: The sequenced crease pattern for making the heptagon.
Book I, 23 Definitions. One-page visual illustration.
Euclid's Elements Book.
Geometry Online Glossary .
Geometry Glossary based on the new New York State
mathematics standards initiative.