Circumcircle of a triangle 
Table of Content 8




Proposed Problem 82.
Circumcircle, Circumcenter.
Area of the Contact Triangle, inradius, circumradius. 

Proposed Problem 81.
Circumcircle, Circumcenter.
Area of a triangle, side, inradius, circumradius. 

Proposed Problem 67: Circumcenter
Triangle, Circumcircle, Angles, Cyclic Quadrilateral.


Miquel's
Pentagram with Dynamic Geometry. Circumcircles, Circumcenters.
You can alter the pentagram dynamically in order to test and
prove (or disproved) conjectures and gain mathematical insight that is
less readily available with static drawings by hand. 

Miquel's Pentagram Theorem
Interactive proof with animation and key theorems.
Circumcircles, Circumcenters. 

Adams' Circle
Theorem. Circumcircle, Circumcenter of
the contact triangle


Lemoine Theorem.
Circumcircle, Tangent, Collinear points. 

Sawayama Thebault's
theorem. Circumcircle, Incircle, Collinear points. 

The Bevan Point The
circumcenter of the excentral triangle. Illustration with animation.
Circumcircle.


The Bevan Point: Puzzle
The circumcenter of the excentral triangle. Circumcircle. 
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