Go Geometry Education: Orthocenter

Plane Geometry: Circumcircle, Circumradius of a triangle, Theorems and Problems 5

Circumcircle of a triangle - Table of Content 5

Circumcircle Index


Angle between two Simson Lines. Proof with animation.

Simson Line. A proof of Simson line with animation.

Elearning Geometry

Triangle, Three Medians, Circumcircles, Six Concyclic Circumcenters. Dynamic Geometry.
Step-by-Step construction, Manipulation, and animation.
Prove proposition.

Elearn 209

Proposed Problem 209. Circumcenter of the contact triangle.
Triangle, Circumcircle, Incircles, Inradius.

Triangle Centers Video

Journey to the Center of a Triangle (1976). Incenter, Circumcircle, Circumcenter, Centroid, Orthocenter.

Feuerbach Points and Nine-Point Circle with interactive animation, manipulation, and step-by-step construction.

Feuerbach Point Facts.
Distances between Feuerbach point and the incenter, nine-point center, centroid, Spieker point, and Circumcenter, Circumcircle.

Steiner Point
Circumcircle, Circumcenter, Lemoine Point. 


Sangaku Problem (An Old Japanese Theorem). Inradii, Carnot's theorem.

Carnot Theorem. Circumcircle, Circumcenter, circumradius, inradius

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