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Triangles
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Demonstrations 281  300 of 499
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
The Distance from the Circumcenter to an Excenter
The Product of the Circumradius and an Exradius
Another Relation between the Areas of Triangles Associated with an Excircle
On the Areas of Triangles Associated with an Excircle
The Sum of the Circumradii of Three Subtriangles
The Sum of the Square Roots of the Areas of Three Subtriangles
The Sum of the Perimeters of Three Subtriangles
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