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Free, open-source online mathematics for students, teachers and workers
Classical Geometry
TRIANGLES
Triangle
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Centroid
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Centroid
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Circumcenter
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Incenter
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Orthocenter
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Euler Line
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Gergonne Point
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Ceva's Theorem
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Ceva's Theorem
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Isotomic Conjugate
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Menelaus's Theorem
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Napoleon's Theorem
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Finsler-Hadwiger Theorem
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Morley's Trisector Theorem
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Viviani's Theorem
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Van Aubel's Theorem
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Thébault's I Problem
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Fagnano's Problem
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Droz-Farny Line Theorem
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CIRCLES
Inscribed Angle in Circle
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Simson Line
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Circle Power
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Radical Axis
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Radical Axis - Pencil of Circles
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Radical Center
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Circle Inversion
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Circle Inversion - Circles and Lines
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Circle Polar Line
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Circle Polar Line Reciprocity
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Exterior Point
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Interior Point
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Exterior Point - Bitangent Circle
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Interior Point - Bitangent Circle
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D'Alembert Theorem
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Apollonius Tangency Problem
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Apollonius Tangency Problem
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Apollonius Tangency Problem - 8 circles
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Miquel's Theorem
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Clifford's Theorem
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Five Circles Theorem
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Ptolemy's Theorem
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Ptolemy's Theorem with an Equilateral Triangle
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Equal Incircles Theorem
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Three Tangents Theorem
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Apollonius Circle
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Constant Chord Theorem
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Malfatti Circles
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Feuerbach's Circle
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Deltoid
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Deltoid in an Astroid
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Nested Hypocycloids
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Complementary Hypocycloids
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Pappus Chain
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Conway Circle
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PLANE CURVES
Astroid
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Classic Spirals
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