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Triangles
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Demonstrations 521  540 of 739
A Circumcircle through the Midpoint of a Triangle's Side
A Concurrency Generated by the Angle Bisectors
The Gergonne Point
The Intersection of Circumcircles of Medial Triangles
Intersecting Circles and a Right Angle
The Line through the Incenter and Circumcenter
A Collinearity between the NinePoint Center, the Foot of an Altitude, and a Midpoint
A Triangle Formed by the Centers of Three NinePoint Circles
Area of a Hexagon Formed by the Vertices and Altitude Extensions of a Triangle
Kosnita's Theorem
A Concurrency of Lines Joining Orthocenters
Two Triangles of Equal Area on Either Side of an Angle Bisector
The Distances to the Incenter and Excenters from the Circumcenter
Dissecting a Regular Triangle into Three Similar Tiles
Point in Triangle
Triangle Interior
The Triangle Formed by the Centers of the Miquel Circles
Projections of Midpoints onto Circumradii
The Sum of the Reciprocals of the Exradii
The Product of the Inradius and Three Exradii
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