Triangles Theorems and Problems
Page 28




Proposed Problem
137. Orthic Triangle, Altitudes, Perpendicular, Incircle, Collinear Points, Parallelogram. 

Proposed Problem
136. Orthic Triangle, Altitudes, Perpendicular, Concyclic Points. 

Proposed Problem
135. Orthic Triangle, Altitudes, Perpendicular, Parallel 

Proposed Problem
134. Orthic Triangle, Altitudes, Angle Bisectors, Orthocenter, Incenter. 

Pappus Theorem.
Dynamic Geometry.
StepbyStep construction, Manipulation, and animation. 

Interactive
Gergonne Line and Nobbs Points.
Dynamic Geometry.
StepbyStep construction, Manipulation, and animation. 

Interactive
Simson Line.
Dynamic Geometry.
StepbyStep construction, Manipulation, and animation. 


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