

Euclid ’s parallel postulate may also be stated as one and only one parallel to a given line goes through a given point not on the line.Įlliptic geometry uses a modification of Postulate II. Hyperbolic geometry is based on changing Euclid ’s parallelpostulate, which is also referred to as Euclid ’s fifth postulate, the last of the five postulates of Euclidian Geometry. Although there are different types of non-Euclidean geometry which do not use all of the postulates or make alterations of one or more of the postulates of Euclidean geometry, hyperbolic and elliptic are usually most closely associated with the term non-Euclidean geometry. If a transversal falls on two lines in such a way that the interior angles on one side of the transversal are less than two right angles, then the lines meet on the side on which the angles are less than two right angles.Ī consistent logical system for which one of these postulates is modified in an essential way is non-Euclidean geometry.All right angles are equal to one another.


Non-Euclidean geometry refers to certain types of geometry that differ from plane geometry and solid geometry, which dominated the realm of mathematics for several centuries.
