Online Geometry: Orthic Triangle

Orthic Triangle, Theorems and Problems - Table of Content

Orthic Triangle Index

Nine-point-circle, Euler Line, HTML5 Animation for iPad and Nexus

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

Orthic triangle, geometry problem

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

Orthic triangle, Orthocenter, Congruence

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

Clawson Point

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

Elearning 139: Triangle Area

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

Nagel Theorem

Proposed Problem 138. Nagel's Theorem, Orthic Triangle, Altitudes, Circumradius, Perpendicular.

Geometry Problem 137

Proposed Problem 137. Orthic Triangle, Altitudes, Perpendicular, Incircle, Collinear Points, Parallelogram.

Geometry Problem 136

Proposed Problem 136. Orthic Triangle, Altitudes, Perpendicular, Concyclic Points.

Geometry Problem 135

Proposed Problem 135. Orthic Triangle, Altitudes, Perpendicular, Parallel

Geometry Problem 134

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

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