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Related terms:
nasir
axiom
bolyai
obtuse
prove
khayyam
angles
lines
postulate
intersect
geometry
fifth postulate
quadrilateral
elements
straight lines
elliptic geometry
equivalent
parallel postulate
euclidean geometry
hyperbolic geometry
saccheri quadrilateral
Wikipedia sources: History of geometry Non-Euclidean geometry Parallel postulate Context for words: saccheri |
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