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Plane Geometry
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Demonstrations 181  200 of 996
Rotation as Product of Two Reflections
NinePoint Circle in the Complex Plane
Polyhedron Faces Identification
Overlapping Circles
Tetrads
Reference Angles
NonEuclidean Triangle Continuum
Sinai Billiard
The Interior Angles of a Triangle Sum to Pi
Radical Axis and Radical Center
Bisectors of Quadrilaterals
Recursive Exercises VIII: Kites and Darts
Rational Triangles with Area Less than 102
Generating a Cardioid IV: Feet of Perpendiculars
Generating a Cardioid II: Reflecting in Tangents
Generating a Cardioid I: One Circle Rolling around Another
Generating a Lemniscate I: Envelope of Circles
Packing Squares with Triangles
Recursive Exercises V: Nested Triangles
Recursive Exercises III: Fire Patterns
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