Lambert quadrilateral
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Connections
angle
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geometry
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International Standard Book Number
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quadrilateral
Entity
Ibn al-Haytham
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Euclidean geometry
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right angle
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hyperbolic function
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non-Euclidean geometry
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hyperbolic geometry
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parallel postulate
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elliptic geometry
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Gaussian curvature
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fundamental domain
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Saccheri quadrilateral
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