

Geometry:
Orthocenter of a triangle, Theorems and Problems 
Index 9




Proposed Problem 427.
Triangle, Two Altitudes, Square of a Side, Orthocenter. 

Proposed Problem 413.
Cyclic Quadrilateral, Orthocenter, Parallelogram, Concurrency,
Congruence. 

Proposed Problem 408.
Cyclic quadrilateral, Perpendicular, Parallelogram, Congruence,
Orthocenter. 

Proposed Problem 393.
Triangle, Orthocenter, Circumcircles, Congruence, Collinear. 

Geometry Art 61  70.
Triangle, Quadrilateral, Circle, Cyclic, Similarity. 
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Triangle Centers 
Orthocenter 
Altitude 
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Antonio Gutierrez






