Classical Theorems  Page 5




Complete Quadrilateral: OrtholineSteiner Line.
Using TracenPoche Dynamic Software
StepbyStep construction, Manipulation, and animation 

Four Circles Theorem Using Interactive Dynamic Software
StepbyStep construction, Manipulation, and animation. 

Three Circles Theorem
Using TracenPoche Dynamic Software 

Sangaku
Geometry Theorem: Three circles and a tangent line. 

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

Van Aubel's Theorem II:
Triangle and Cevians.


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


The Bevan Point The
circumcenter of the excentral triangle. Illustration with animation.


Butterfly Theorem
Proof with animation.

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