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Triangles
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Demonstrations 401  420 of 518
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
First DrozFarny Circle
Barrow's Inequality
The Taylor Circle
The Circumcircles of Four Triangles
A Congruent Angle inside the Incircle
The Area of a Triangle inside the Incircle
The Radii of Four Incircles
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