By A Mystery Man Writer
Non-Euclidean geometry, literally any geometry that is not the same as Euclidean geometry. Although the term is frequently used to refer only to hyperbolic geometry, common usage includes those few geometries (hyperbolic and spherical) that differ from but are very close to Euclidean geometry.
Non-Euclidean Geometry, Kid Celephais Wiki
Finding a non-euclidean geometry model - Howard Eves' Geometry - Mathematics Stack Exchange
Introduction to Non-Euclidean Geometry - EscherMath
Euclidean and Non-Euclidean Geometry: An Analytic Approach: 9780521276351: Ryan, Patrick J.: Books
Non-Euclidean geometry - Wikipedia
Graphical illustration of the properties of Euclidean and non-Euclidean
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