Article
Article
Plane geometry
Article By:
Baldwin, Harry L., Jr. Department of Mathematics, San Diego City College, San Diego, California.
Last reviewed:August 2020
DOI:https://doi.org/10.1036/1097-8542.757348
The branch of mathematics that deals with geometric figures, that is, collections of points that all lie in the same plane (coplanar). Although the words “point” and “plane” are undefined concepts, for elementary applications the intuitive meanings will serve: a point is a location, and a plane is a flat surface. For similar definitions, together with a discussion of the postulates and axioms (assumed truths) used in plane geometry, See also: Euclidean geometry .
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