Concurrent lines
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Pappus's hexagon theorem
Line (geometry)
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Tropical geometry
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Arrangement of lines
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Pascal's theorem
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List of theorems
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Pappus of Alexandria
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Pappus's theorem
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Degenerate conic
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Desargues's theorem
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Projective geometry
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Affine geometry
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Projective space
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René Descartes
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Projective plane
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History of mathematics
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