Non-Euclidean Geometry

(1) Hyperbolic Geometry (or Bolyai–Lobachevskian geometry) – Triangles add up to less than 180 degrees, or
(2) Elliptic Geometry- Triangles add up to higher than 180 degrees.
(3) Euclidian Geometry or “Standard” geometry- Triangle add up to 180 degrees.

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