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Triangles
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Demonstrations 141  160 of 450
The Lunes of Hippocrates
Difference Formula for Cosine
How Many Triangles Are There?
Center of an Equilateral Triangle Circumscribing a Given Parabola
Centre d'un triangle équilatéral circonscrit à une parabole (French)
The Sum of the Interior Angles of a Triangle Equals 180 Degrees by Paper Folding
Triangles on a Sphere
The Johnson Circles
Triangles in the Poincaré Disk
Knopp's Osgood Curve Construction
Incircles in Right Triangles
The Conway Circle
Median Theorem for Polygons
Lucas Circles
Kenmotu Circle
Area of a Triangle in the Poincaré Disk
A Dissection Proof of Pythagoras's Theorem
The Torricelli Point
Theorem of the Equal Incircles
Folding an Equilateral Triangle in a Square
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