Triangle Theorems

Isosceles Triangle Theorem, by Alex Hafkenschiel

The Opposite Parts Theorem, by Tim Folse

The Exterior Angle Theorem, by Tim Folse

The Triangle Inequality, by Tim Hassall

The Hinge Theorem, by Tim Hassall

The converse of the Hinge Theorem, by Alex Hafkenschiel

Points of Concurrency

Circumcenter, by Tim Hassall

Incenter, by Alex Hafkenschiel

Centroid, by Tim Folse