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.
Origami: a Heptagon from a square.
Book I, 23 Definitions. One-page visual illustration.
Euclid's Elements Book.
Geometry for Children: Polygon Song
Geometry: Thinking about Thinking. Pythagoras, Euclid, Euclidean geometry,
inductive reasoning, deductive reasoning.
Geometry Online Glossary .
Geometry Glossary based on the new New York State
mathematics standards initiative.