collinear points - points that lie on the same line, coplanar points - points that lie on the same plane, dimension - a property of space consisting of the measure of distance in one direction, endpoint - the point at either end of a line segment or the point at the start of a ray, line - a straight path that has no thickness and extends forever, line segment - a portion of a line consisting of two points and all the points between them, plane - a flat surface that has no thickness and extends forever, postulate - a statement accepted as true without proof as a basis for reasoning; another name for an axiom, ray - a portion of a line that starts at one point and extends forever in only one direction, space - the unlimited region in which all things exist, undefined terms - terms used to describe basic geometric figures that are fundamental to all other geometric figures and, as such, cannot be defined by using other geometric terms, point - a location in space that has neither size nor dimension,

Geometry A Unit 1 Lesson 2

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