Editing Non-Euclidean Geometry (section)

== <span style="color: #FFFFFF;">Remembering</span> ==
* '''Non-Euclidean Geometry''' — Any geometry not based on Euclid's 5th postulate.
* '''Elliptic Geometry (Riemannian)''' — Geometry of a sphere; parallel lines meet and triangles > 180°.
* '''Hyperbolic Geometry (Lobachevskian)''' — Geometry of a saddle-shape; parallel lines diverge and triangles < 180°.
* '''Geodesic''' — The "straightest" possible path on a curved surface.
* '''Curvature''' — The degree to which a surface deviates from being flat.
* '''Great Circle''' — A circle on a sphere whose center coincides with the center of the sphere (e.g., the Equator).
* '''Bernhard Riemann''' — Mathematician who generalized geometry to all types of curved spaces.
* '''Janos Bolyai & Nikolai Lobachevsky''' — Co-discoverers of Hyperbolic geometry.
* '''Manifold''' — A space that looks "flat" up close but can be curved globally (like Earth).
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