Geometry Expressions Symbolic System Constructions  Recent
Additions

I have used
Geometry Expressions to visualize the
Archimedean Twins
above and check out a variety of conjectures. Geometry
Expressions is the world's first Interactive Symbolic Geometry
System. This means: Geometric figures can be defined by either
Symbolic Constraints or numeric locations.
You can
download Geometry Expressions 2 Free Trial. It is a fully
featured 30 day evaluation copy of the software. All
constraints, constructions and measurements are available for
you to use.






Geometry Expressions Help.
Interactive Mind Map. 


Sangaku
Geometry Theorem: Cyclic Quadrilateral.
Inradii, Rectangle. 


Apollonius' Problem for Three Circles
Illustration with animation and sound.



Sawayama Thebault's
theorem 


Seven Circles Theorem.
Step by Step illustration of this beautiful theorem. 


Mittenpunkt Point



Proposed Problem 57: Angle bisector, circles
Cyclic Quadrilateral. 


Proposed Problem 56: Angle bisector, circles
Parallel Lines. 


Proposed Problem 55: Angle bisector, circles
Cyclic Quadrilateral. 


Proposed Problem 54: Angle bisector, circles
Midpoint of arc. 


Proposed Problem 53: Angle bisector, circles 


Sangaku
Proposed Problem 41. "Mickey Mouse."
Three circles, tangents, radii. 