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Jay Warendorff
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Demonstrations 1  20 of 271
Another Variant of Kosnita's Theorem
The Begonia Point
An Application of the GergonneEuler Theorem
The Knight's Tour
The Excentral Triangle and a Related Hexagon
Four Concyclic Points
Cross's Theorem
A Concurrency from Midpoints of Arcs of the Circumcircle
A Concurrency of Lines through Points of Tangency with Excircles
A Concurrency from Six Pedal Points
Zeckendorf Representation of Integers
A 2011 IMO Tangency Problem
The Fuhrmann Circle
A Chinese Knight's Tour
The Triangles Formed by the Endpoints and Midpoints of Cevians
An Angle Bisection
Three Concyclic Sets of Points Associated with the Orthic Triangle
The SeeSaw Lemma
A Concurrency from the Reflection of the Incircle's Contact Points across the Incenter
Concurrency via Midpoints
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