Octagons, Theorems and Problems - Table of Content

Problem 583.
Quadrilateral, Diagonals, Circumcenters, Parallelogram, Octagon, Areas.

Proposed Problem 287: Regular Octagon.

Proposed Problem 286: Square, Midpoints, Octagon.

Octagon for Children. Video.

Proposed Problem 161. Parallelogram, Midpoints, Octagon, Areas.  

Proposed Problem 225. Viviani's Theorem Extension, Regular Polygon, Apothem, Distance.  

Geometry for Children: Polygon Song
Octagon

Geometry for Children: Shapes (Polygons) Sesame Street.
Octagon.

Video: Tessellations by Square One TV.
"Come on and put a square here
And put an octagon there
And when they fit real tight
We'll know we're doing it right"

Stonehenge builders had geometry skills to rival Pythagoras. Five years of detailed research, carried out by the Oxford University landscape archaeologist Anthony Johnson, claims that Stonehenge was designed and built using advanced geometry. "The surveyors started by using a rope to create a circle, then laid out the four corners of a square on its circumference, before laying out a second similar square, thus creating an inner octagon..."

Crop Circles and Complexity
Crop Circles and Sacred Geometry
 

Nazca Lines and Crop Circles

Looted Peru Moche Headdress Recovered in London
Octagon: Feline sea god with octopus-like tentacles

Euclid's Elements Book I, 23 Definitions. One-page visual illustration.
Euclid's Elements Book. Index

Geometry Online Glossary . Octagon.
Geometry Glossary based on the new New York State mathematics standards initiative.

Interactive Geometry Glossary using AnswerTips technology.
Octagon.