Triangles: Theorems and Problems 28
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![Triangles](../geometry/triangles_index_17.jpg) |
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![Geometry Problem 137](../problem/p137_orthic_triangle_17.jpg) |
Proposed Problem
137. Orthic Triangle, Altitudes, Perpendicular, Incircle, Collinear Points, Parallelogram. |
![Geometry Problem 136](../problem/p136_orthic_triangle_17.jpg) |
Proposed Problem
136. Orthic Triangle, Altitudes, Perpendicular, Concyclic Points. |
![Geometry Problem 135](../problem/p135_orthic_triangle_17.jpg) |
Proposed Problem
135. Orthic Triangle, Altitudes, Perpendicular, Parallel |
![Geometry Problem 134](../problem/p134_orthic_triangle_17.jpg) |
Proposed Problem
134. Orthic Triangle, Altitudes, Angle Bisectors, Orthocenter, Incenter. |
![Pappus Theorem](../geometry/pappus_theorem_17.jpg) |
Pappus Theorem.
Dynamic Geometry.
Step-by-Step construction, Manipulation, and animation. |
![Gergonne Line](../geometry/gergonne_line_17.jpg) |
Interactive
Gergonne Line and Nobbs Points.
Dynamic Geometry.
Step-by-Step construction, Manipulation, and animation. |
![Interactive Simson Line](../geometry/interactive_simson_line_17.jpg) |
Interactive
Simson Line.
Dynamic Geometry.
Step-by-Step construction, Manipulation, and animation. |
![Geometry problems 281-290](../math_geometry_online_courses/geometry_problems_281_290_1.jpg)
![Triangle Word Cloud](../software/word_cloud_triangle_1.jpg)
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