Geometry, Triangles, Orthic Triangle, Theorems, Problems, College, High School

Orthic Triangle - Table of Content

Orthic Axis Index

Nine-Point Center, Nine-Point Circle, Euler Line. Interactive illustration.
Circumcenter, Centroid, Orthocenter
HTML5 Animation for iPad and Nexus
Adobe Flash Animation.

Geometry Problem 1457.
Altitudes, Circles, Similarity, Product of the Inradii Lengths, iPad. Step-by-step illustration using GeoGebra.

Geometry Problem 1456.
Altitudes, Orthic Triangle, Circumcircle, Parallel lines, Similarity, Area, iPad. Step-by-step illustration using GeoGebra.

Geometry Problem 1233
Triangle, Euler Line, Orthic Axis, Perpendicular, 90 Degrees, Orthic Triangle.

Geometry Problem 1232
Triangle, Altitudes, Orthic Triangle, Collinearity, Orthic Axis.

Geometry Problem 735.
Triangle, Altitude, Perpendicular, Semiperimeter of the Orthic Triangle, Congruence.

Geometry Problem 732.
Triangle, Altitude, Orthic Triangle, Orthocenter, Congruence, Parallelogram.

Geometry Problem 630: Clawson Point.
Orthic and Extangents Triangles, Concurrent lines.

Proposed Problem 139. Triangle Area, Orthic Triangle, Semiperimeter, Circumradius.

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

Proposed Problem 134. Orthic Triangle, Altitudes, Angle Bisectors, Orthocenter, Incenter.

Problem 51: Fagnano's Problem
Inscribed Triangle with the Minimum Perimeter. Orthic triangle.