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![College Geometry Online, eLearning](../machu_picchu_h1_910.jpg)
Geometry, Triangles, Orthic
Triangle, Theorems,
Problems, College, High School
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Orthic Triangle - Table of Content
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![Orthic Triangle Index](orthic_triangle_index_1.jpg) |
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![Orthic Axis Index](orthic-axis-index-1.jpg) |
Orthic Axis Index |
![Nine-point-circle, Euler Line, HTML5 Animation for iPad and Nexus](../center/nine_point_center_euler_html5_animation_ipad_nexus_1.jpg) |
Nine-Point Center, Nine-Point Circle, Euler Line.
Interactive illustration.
Circumcenter, Centroid, Orthocenter
HTML5 Animation for iPad and Nexus
Adobe Flash Animation.
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![Geometry Problem 1457](../school-college/5/p1457-orthocenter-triangle-similarity-circles-radii-1.jpg) |
Geometry
Problem 1457.
Altitudes, Circles, Similarity,
Product of the Inradii Lengths,
iPad. Step-by-step illustration using GeoGebra. |
![Geometry Problem 1456](../school-college/5/p1456-orthocenter-triangle-similarity-circles-geogebra-ipad-1.jpg) |
Geometry
Problem 1456.
Altitudes, Orthic Triangle, Circumcircle, Parallel lines, Similarity, Area,
iPad. Step-by-step illustration using GeoGebra. |
![Geometry problem 1233](../school-college/3/p1233-orthic-axis-triangle-euler-line-perpendicular-1.jpg) |
Geometry Problem 1233
Triangle, Euler Line, Orthic Axis, Perpendicular, 90 Degrees, Orthic Triangle. |
![Geometry problem 1232](../school-college/3/p1232-orthic-axis-triangle-altitude-collinear-1.jpg) |
Geometry Problem 1232
Triangle, Altitudes, Orthic Triangle, Collinearity, Orthic Axis. |
![Orthic triangle, geometry problem](../problem/p735_triangle_orthic_1.jpg) |
Geometry Problem
735.
Triangle, Altitude, Perpendicular, Semiperimeter of the Orthic Triangle, Congruence. |
![Orthic triangle, Orthocenter, Congruence](../problem/p732_orthic_triangle_1.jpg) |
Geometry Problem
732.
Triangle, Altitude, Orthic Triangle, Orthocenter, Congruence, Parallelogram. |
![Clawson Point](../problem/p630_clawson_point_1.jpg) |
Geometry Problem 630: Clawson Point.
Orthic and Extangents Triangles, Concurrent lines. |
![Elearning 139: Triangle Area](../problem/p139_area_triangle_17.jpg) |
Proposed Problem 139. Triangle
Area, Orthic Triangle, Semiperimeter, Circumradius. |
![Nagel Theorem](../problem/p138_nagel_theorem_17.jpg) |
Proposed Problem 138. Nagel's
Theorem, Orthic Triangle, Altitudes, Circumradius, Perpendicular. |
![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. |
![](../problem/p051_fagnano_triangle_170.jpg) |
Problem 51:
Fagnano's Problem
Inscribed Triangle with the Minimum Perimeter. Orthic triangle. |
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