# Geometry: Hexagons, Theorems and Problems - Table of Content

Word Cloud of Hexagon.
Visual Summary.

Spring Reveals Saturn's Hexagon Jet Stream, NASA's Cassini mission.
The Persistent Hexagon.

Cassini Images Bizarre Hexagon on Saturn. The Persistent Hexagon.

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

Euclid's Elements, Book XIII, Proposition 10 Pentagon, Hexagon, and Decagon. One page visual illustration.

The Mystery Hexagon on SATURN - Video. The Persistent Hexagon.

Optical Prism with Regular Hexagonal Form.
Scene created using Prism HD for iPad.

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

Snowflakes: Hexagonal Symmetry and the Golden Rectangle.
The individual ice crystals often have hexagonal symmetry.

Pappus Theorem. Dynamic Geometry.
Step-by-Step construction, Manipulation, and animation.

Marion Walter's Theorem and Related Topics: Index
Triangle and Hexagon Areas.

Triangle and Squares 15.
Triangles, Squares and Hexagon.

Marion Walter's Theorem: Triangle and Hexagon areas: Using TracenPoche Dynamic Geometry Software

Puzzle: Marion Walter's theorem. Puzzle cut: 12 Piece ZigZag
Based on Marion Walter's theorem

Geometry Problem 827: Brianchon Corollary
Circumscribed Hexagon, Tangency Points, Diagonal, Opposite Sides, Concurrent lines.

Geometry Problem 826: Brianchon's Theorem
Circumscribed Hexagon, Concurrent Diagonals.

Geometry Problem 791
Regular Hexagon, Midpoints of Side and Diagonal, Equilateral Triangle, Area.

Geometry Problem 599
Regular Hexagon, Square, Midpoint, Angle, Degrees.

Proposed Problem 402.
Hexagon, Triangle, Centroid, Parallel, Congruence, Similarity.

Proposed Problem 346.
Equal circles, Tangents, Hexagon, Semiperimeter.

Proposed Problem 345.
Equal circles, Tangents, Concurrent lines, Hexagon, Semiperimeter.

Proposed Problem 343.
Hexagon, Inscribed circle, Tangent, Semiperimeter.

Proposed Problem 79: Triangle. Similarity, Altitudes, Orthocenter, Incircles, Inradii.

Sangaku Problem (An Old Japanese Theorem). Inradii, Carnot's theorem.

Proposed Problem 61: Triangle, Trisection of Sides

Proposed Problem 122. Marion Walter's Theorem. Area of triangle and Hexagon, Trisection of Sides.

Proposed Problem 125. Area of Triangle, Star, Trisection of Sides.

Teamgeist world cup official ball and Geometry
Telstar = 12 black pentagons in 20 white hexagon

Kurschak's Tile and Theorem. Jozsef Kurschak (Hungary, 1864-1933) An elegant and a purely geometric way of finding the area of a regular dodecagon.
A regular dodecagon inscribed in a unit circle has area 3.

Geometry jokes Crossword.

The Flower of Life Index:
Christ Redeemer, Taj Mahal,
Machu Picchu, Chichen Itza

Roman Colosseum, Petra, Jordan
Great Wall of China

Geometry of Circles "Sesame Street" by Philip Glass, 1979.

Sacred Geometry: the Vesica Piscis by Charles Gilchrist.

Sacred Geometry: Seven Tangent Circles by Charles Gilchrist.

Sacred Geometry: Introduction by Charles Gilchrist.

Geometry: Thinking about Thinking. Pythagoras, Euclid, Euclidean geometry, inductive reasoning, deductive reasoning.

The Metamorphosis of the Cube Foldings and Unfolding between Polygons and Polytopes.

Interactive Mind Map of the Van Hiele Model of Geometric Thought
Level 0. (Basic Level) Visualization.

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

Trailer of FLATLAND: The Movie.
Adapted from Flatland: A Romance of Many Dimensions (1884)
"All Flatland's inhabitants--straight lines, triangles, squares, pentagons, hexagons, and other figures--are trapped in their planar geometry."

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