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![Go Geometry Education: Orthocenter](h_triangle_center_910.jpg)
Plane Geometry: Circumcircle, Circumradius of a triangle, Theorems and Problems
5
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Circumcircle of a triangle -
Table of Content 5
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![Circumcircle Index](circumcircle_index_1.jpg) |
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![](../simsonangle170x100.jpg) |
Angle between two
Simson Lines. Proof with animation.
Circumcircle |
![](../simson_line_170.jpg) |
Simson Line. A proof
of Simson line with animation.
Circumcircle. |
![Elearning Geometry](../geometry/triangle_median_circ_17.jpg) |
Triangle, Three Medians, Circumcircles, Six Concyclic Circumcenters.
Dynamic Geometry.
Step-by-Step construction, Manipulation, and animation.
Prove proposition. |
![Elearn 209](http://gogeometry.com/
problem/p209_triangle_incircles_17.jpg) |
Proposed Problem 209. Circumcenter of the contact triangle.
Triangle, Circumcircle, Incircles, Inradius. |
![Triangle Centers Video](../center/triangle_center_video_17.jpg) |
Journey
to the Center of a Triangle (1976). Incenter, Circumcircle, Circumcenter, Centroid, Orthocenter. |
![](../geometry/feuerbach_points_17.jpg) |
Feuerbach Points and Nine-Point Circle with interactive
animation, manipulation, and step-by-step construction.
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![](feuerbach_point_facts_170.jpg) |
Feuerbach
Point Facts.
Distances between Feuerbach point and the incenter,
nine-point center, centroid, Spieker point, and
Circumcenter, Circumcircle. |
![](../center/steiner_point_170.jpg) |
Steiner Point
Circumcircle, Circumcenter, Lemoine Point. |
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Sangaku Problem (An Old Japanese Theorem).
Inradii, Carnot's theorem.
Circumcircle. |
![](../carnot_theorem_170.jpg)
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Carnot Theorem.
Circumcircle, Circumcenter, circumradius, inradius |
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