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Demonstrations 21 - 40 of 272
A 2011 IMO Tangency Problem
The Fuhrmann Circle
The Triangles Formed by the Endpoints and Midpoints of Cevians
An Angle Bisection
Three Concyclic Sets of Points Associated with the Orthic Triangle
The See-Saw Lemma
A Concurrency from the Reflection of the Incircle's Contact Points across the Incenter
Concurrency via Midpoints
A Triangle Formed by the Centers of Three Circles
Concurrency Induced by a Cevian
Three Circles Defined by Chords
A Line Associated with an Excircle
Intersection of an Altitude and a Line through the Incenter
Rhombi at the Incenter of a Triangle
Tangents to the Incircle from a Point on the Circumcircle
Quicksort versus Selection Sort
Altitudes and Incircles
A Collinearity Involving an Excircle, the Incircle, and the Circumcircle
Points Symmetric to the Orthocenter with Respect to the Sides of a Triangle
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