

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

Circumcircle of a triangle 
Table of Content 5




Angle between two
Simson Lines. Proof with animation.
Circumcircle 

Simson Line. A proof
of Simson line with animation.
Circumcircle. 

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

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

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

Feuerbach Points and NinePoint Circle with interactive
animation, manipulation, and stepbystep construction.


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

Steiner Point
Circumcircle, Circumcenter, Lemoine Point. 

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

Carnot Theorem.
Circumcircle, Circumcenter, circumradius, inradius 
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