point - names a location; has no dimension, line - names a straight path of points in a plane; has no width or thickness, and it continues forever in one dimension, plane - a flat surface with no thickness, and it extends forever in two dimensions, ray - part of a line that starts at an endpoint and extends forever in one direction, line segment - part of a line consisting of two endpoints and all points between them , bisect - to divide into two congruent parts, collinear - points that lie on the same line, coplanar - points that lie in the same plane, distance - a measure of the length of the shortest line segment that would connect them between two points, endpoint - a point at an end of a segment or the starting point of a ray, undefined term - basic terms that are impossible to write an actual definition for , postulate - a statement that is accepted as true without proof,

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