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![Go Geometry Education: Orthocenter](h_triangle_center_910.jpg)
Geometry:
Orthocenter of a triangle, Theorems and Problems -
Index 9
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![Orthocenter Index](orthocenter_altitude_index.jpg) |
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![Triangle, Altitudes](../problem/p427_triangle_altitude_17.jpg) |
Proposed Problem 427.
Triangle, Two Altitudes, Square of a Side, Orthocenter. |
![Cyclic quadrilateral, Orthocenter, Parallelogram, Congruence](../problem/p413_cyclic_quadrilateral_1.jpg) |
Proposed Problem 413.
Cyclic Quadrilateral, Orthocenter, Parallelogram, Concurrency,
Congruence. |
![Cyclic quadrilateral, Perpendicular, Parallelogram, Congruence](../problem/p408_cyclic_quadrilateral_1.jpg) |
Proposed Problem 408.
Cyclic quadrilateral, Perpendicular, Parallelogram, Congruence,
Orthocenter. |
![Triangle, Orthocenter](../problem/p393_triangle_orthocenter_1.jpg) |
Proposed Problem 393.
Triangle, Orthocenter, Circumcircles, Congruence, Collinear. |
![Online education degree: geometry art 61-70](../math_geometry_online_courses/geometry-art-061-070.jpg) |
Geometry Art 61 - 70.
Triangle, Quadrilateral, Circle, Cyclic, Similarity. |
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Antonio Gutierrez
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