Pappus of Alexandria
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Cross-ratio
Concyclic points
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Poincaré half-plane model
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J-invariant
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Odds ratio
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Projective line
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Projective linear group
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List of algebraic geometry topics
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Möbius transformation
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Inversive geometry
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Unit disk
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Projective geometry
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Erlangen program
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Hyperbolic geometry
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Foundations of mathematics
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Ceva's theorem
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Torus
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Non-Euclidean geometry
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Hypercomplex number
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Circle
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Cross ratio
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