Related terms:
parallel postulate
saccheri
hyperbolic space
bolyai
euclidean geometry
lines through
fifth postulate
hyperbolic plane
saccheri quadrilateral
elliptic geometry
lobachevsky
spherical geometry
obtuse
right angle
khayyam
postulate
parallel lines
two lines
straight lines
geometria
intersect
quadrilateral
hyperbolic
euclidean
converse
straight line
distance between
Wikipedia sources:
Hyperbolic geometry
Non-Euclidean geometry
Marilyn vos Savant
Parallel postulate
Shape of the Universe
Pythagorean theorem
Parallel (geometry)
Apollonian gasket
Mathematics in medieval Islam
Axiom
Context for words:
hyperbolic
geometry
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