College Geometry Online, eLearning

Octagons, Theorems and Problems - Index

Octagon Index 

Isolines illustration: Regular polygons

Geometric Art: Isolines, Regular Polygons, Square, Octagon, Hexadecagon, Parallel Lines, Symmetry, Software

Quadrilateral, Circumcenters

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

Isolines illustration: Pentagon

Geometric Art: Isolines, Polygons, Rhombus, Triangle, Octagon, Parallel Lines, Symmetry, Geometry for Kids, Sacred Geometry, Software

Octagon Word Cloud

Octagon Word Cloud. Geometry for Kids.

Regular Octagon 

Proposed Problem 287: Regular Octagon.

Octagon, Square

Proposed Problem 286: Square, Midpoints, Octagon.

Octagon for children

Octagon for Children. Video.

Elearning 161 Parallelogram and Octagon Areas

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

Viviani theorem extension, regular polygon

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

Tessellation Square

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 and Golden Rectangle

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..."

Nazca Lines and Crop Circles

Nazca Lines and Crop Circles

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

Euclid's Elements 23 definitions

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


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Last updated: Aug 25, 2016