Online Geometry: Equilateral Triangles, Theorems and Problems  Page 5




Hexagon
and Lissajous Art


Index,
Platonic
Solids, Interactive animation,
Tetrahedron in the cube,
Archimedes and the Rhombicuboctahedron with animation,
In the
News,
Video: How to make platonic solids with gum drops and tooth
picks 

Geometry and Cultures
Gold Tumi. 

Triangles
and Lissajous Art


Equilic Quadrilateral.


Napoleon's Theorem. A purely geometric
proof. It uses the Fermat point to prove Napoleon without
transformations.


Morley's Theorem.
Introduction with animation. Triangle + Trisectors = Equilateral
triangle.


Morley's Theorem Puzzle: 22
pieces of polygons. 

Langley's Problem
Adventitious angles. 20° isosceles triangle with animation.


Kurschak's Tile and Theorem.
Jozsef Kurschak (Hungary, 18641933) A square, with equilateral
triangles. An elegant and a purely geometric way of finding the area of
a regular dodecagon.
