College Geometry Online, eLearning

Online Math: Polygons, Theorems and Problems

Polygons Index


Polygon definition

Polygon definition

The Base of the Statue of Liberty, Star Polygon of 11 Vertices and the Golden Rectangle.
HTML5 Animation for iPad.

Polygon Classification

Polygon Classification. Interactive Mind Map.

Isolines illustration: Regular polygons

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


Triangles. Theorems and Problems

Quadrilateral Index 

Quadrilaterals. Theorems and Problems

Pentagon Index

Pentagons. Theorems and Problems


Hexagons. Theorems and Problems
Unlocking the Beauty of Mathematics: Exploring Hexagons, Theorems and Problems through Geometric Art

Heptagon index

Heptagons. Theorems and Problems

Octagon Index

Octagons. Theorems and Problems

Nonagon or enneagon

Nonagon or Enneagon. Theorems and Problems

Regular Decagon

Decagon. Theorems and Problems

Isolines illustration: Pentagon

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

Regular Decagon Art. iPad Apps: Spangled

iPad Apps: Spangled!.
Regular Decagon Art.

Optical Prism with Regular polygonal Form

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

iPad Apps: Springle by Bolasol Inc. Geometric Art: Squares and Pentagons

iPad Apps: Springle by Bolasol Inc. Geometric Art: Squares and Pentagons

Viviani theorem extension, regular polygon

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

Snowflakes: Hexagon Symmetry

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

Chartres Cathedral

Engineering the Impossible: Chartres Cathedral
Circle, Square, Triangle.

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

Geometry Problem 1518

Geometry Problem 1518 and a Thematic Poem.
Boost Your Geometry Skills: Solve for the Number of Sides in an Equiangular Polygon with an Interior Point and Bisected Angle.

Problem 1430

Geometry Problem 1430.
Regular Octagon, Area, Equivalent Figures, Poster, Conformal Mapping.

Geometry problem 1357

Geometry Problem 1357.
Regular Dodecagon, Diagonals, Concurrency, Collinearity, Points, Lines.

Geometry problem 1325

Geometry Problem 1325.
Octagons, Midpoints, Squares, Mobile Apps, iPad.

Geometry problem 1313

Geometry Problem 1313.
Regular Decagon, Pentadecagon, Equilateral Triangle, Congruence.

Kurschak Dodecagon

Geometry Problem 725.
Kurschak's Dodecagon, Square, Equilateral Triangle, Polygon, Midpoints, 30, 60 Degrees.

Inscribed and Circumscribed regular Pentagon, Areas

Proposed Problem 430.
Circumscribed and Inscribed Regular Pentagon, Perpendicular, Areas.

Regular Decagon Art

Geometric Art: Decagon and Pentagon.

Regular Decagon and Decagram Art

Geometric Art: Decagon and Decagram.

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Last updated: Mar 3, 20239