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Lesson 1-1

Vocabulary

TermDefinition
POINT A precise location or place on a plane. Usually represented by a dot. Has no dimension or size
LINE A one-dimensional figure, which has length but no width. Consists of infinitely many points on a straight path that extends in two opposite directions with no end and no thickness
PLANE Consists of infinitely many points and lines on a flat surface that extends without end and has no thickness.
UNDEFINED TERMS Terms whose meanings are accepted without formal definitions. Including the terms point, line, and plane are the basic building blocks of Geometry
DEFINED TERMS In Geometry, new terms are defined using previously defined or known terms
SEGMENT The part of a line that consists of two endpoints, and all points of the line between them.
RAY A ray is the part of a line that consists of one endpoint and all the points of the line on one side of the endpoint.
OPPOSITE RAYS Rays with the same endpoint that lie on the same line.
ANGLE Formed by two rays with the same endpoint. Each ray is a side of the angle and the common endpoints is the vertex of the angle.
LENGTH OF A SEGMENT Distance between two points (A NUMERICAL VALUE)
MEASURE OF AN ANGLE The measure/degree an angle makes (numerical value)
COLLINEAR POINTS Points that lie on the same line
COPLANAR POINTS Points on the same plane
POSTULATE A statement that is assumed to be true
Created by: Mrs. Hynes
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