

Geometry:
Orthocenter of a triangle, Theorems and Problems 
Index 11




Proposed Problem 138. Nagel's
Theorem, Orthic Triangle, Altitudes, Circumradius, Perpendicular. 

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 

Geometry Art 21  30.
Right triangle, Altitude, Incircle and inradius, Congruence, Circle. 
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Triangle Centers 
Orthocenter 
Altitude 
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Antonio Gutierrez






