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Triangles
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Demonstrations 321  340 of 454
Collinearity of an Orthocenter, the Incenter, and the Circumcenter
Concurrent Line Segments Related to the Incircle
Projections, an Altitude, and the Orthocenter
Sums of Squares of Segments Created by a Pedal Triangle
Concyclic Circumcenters
The Intersections of Extended Cevians with Three Circumcircles of Subtriangles
The Sum of the Distances from the Orthocenter to the Vertices
Medial Division of Triangles
The ErdösMordell Inequality
The Intersection of an Angle Bisector and a Perpendicular Bisector
The Product of the Inradius and Semiperimeter of a Triangle
The Product of an Altitude and the Circumradius of a Triangle
An IMO Problem Involving Concurrency
The Product of the Side Lengths of a Triangle
The Medial Triangle and Concurrency at the Nagel Point
A First Morley Triangle Concurrence
Relations between Some Triangles Associated with Excircles
The Extouch and Intouch Triangles of a Triangle
A Relation between Incircles and Excircles
A Generalization of Hansen's Theorem
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