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Geometry
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Demonstrations 2301  2320 of 3148
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 Triangle Model of Criminality
Miter Joint and Fold Joint
Mitering a Closed 3D Path
A Parabolic Mirror
Dissecting a Regular Triangle into Three Similar Tiles
Broken Heart Tangram (Variation)
Point in Triangle
A Polygon That Folds into a Regular Tetrahedron or into a Rectangular Box
Inscribed and Central Angles in a Circle
14Piece Dissection of Juel's Pyramid into a Parallelepiped
Dissecting a Square Pyramid into 15 Pieces
A Net That Folds into an Icosahedron or into a Double Biaugmented Triangular Prism
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
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