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Geometry {Lesson 2}

Points, Lines, and Planes

TermDefinition
Geometry A mathematical system built on accepted facts, basic terms, and definitions.
Undefined terms The basic ideas that you can use to build the definitions of all other figures in geometry.
Point Indicates a location and has no size.
Line Represented by a straight path that extends in two opposite directions who end and have no thickness. This also contains infinitely many points.
Plane Represented by a flat surface that extends without end and has no thickness. It also contains many lines.
Collinear points Points that lie on the same line.
Coplanar Points and lines that lie on the same plane.
Space The set of all points in three dimensions.
Segment Part of a line that consist of two endpoints and all points between them.
Ray Part of a line that consists of one endpoint and all the points of the line on one side of the endpoint.
Opposite rays Two rays that share the same endpoint and share a line.
Postulate/Axiom An accepted statement of fact.
Intersection The set of points the figures have in common.
Created by: Rylee.emma
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