CK-12 Foundation
Ck 12: Interactive Geometry: 5.4 Constructions of Regular Polygons
Learn how to construct regular polygons.
Wolfram Research
Wolfram Math World: Math World: Hexagon
Gives a detailed overview of hexagons, particularly of regular hexagons. Be sure to use the links for unfamiliar notation or variable representation. This site gives formulas for inner radius, circumradius, parameter, and area of a...