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Triangles
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Demonstrations 441  460 of 565
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
A Parallelogram Defined by the Centers of Four Circumcircles
The Contact Triangle and Two Other Subtriangles
The Nagel Point
Nagel's Theorem
Signed Area of a Polygon
Second DrozFarny Circle
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