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Plane Geometry
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Demonstrations 801  820 of 1237
Recursively Defined Partial Tilings of the Plane
Ammann Tiles
Dual Billiards
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
A Parabolic Mirror
Dissecting a Regular Triangle into Three Similar Tiles
Point in Triangle
Inscribed and Central Angles in a Circle
Triangle Interior
The Triangle Formed by the Centers of the Miquel Circles
Projections of Midpoints onto Circumradii
Zonogons: Minkowski Sums of Line Segments in 2D
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
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