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# Geo. Vocab Unit 1

### vocabulary for unit one of eighth grade geometry

TermDefinition
directed line segment A line segment with an initial endpoint and a terminal endpoint.
fractional distance An intermediary point some fraction of the length of a line segment.
point A location with no size, only position.
line A line is made up of points, has no thickness or width, and extends indefinitely in both directions.
plane A flat surface made up of points that has no depth and extends indefinitely in all directions.
space A boundless three-dimensional set of all points.
intersection A set of points common to two or more geometric figures.
undefined terms Words that are not formally explained by means of more basic words and concepts.
postulate A statement that is accepted as true without proof.
theorem A statement that can be proven true using undefined terms, definitions, and postulates.
synthetic geometry The study of geometric figures without the use of coordinates.
analytic geometry The study of geometry that uses the coordinate system.
midpoint The point on a line segment halfway between the endpoints of the segment.
equidistant A point is equidistant from other points if it is the same distance from them.
bisect Separate a line segment into two congruent segments.
segment bisector Any segment, line, plane, or point that intersects a line segment at its midpoint.
distance The length of the line segment between two points.
line segment A measurable part of a line that consists of two points, called endpoints, and all of the points between them.
betweenness of points Point C is between A and B if and only if A, B, and C are collinear and AC + CB = AB
congruent Two figures are congruent if one can be obtained from the other by a sequence of rotations, reflections, and translations.
congruent segments Line segments that are the same length.
constructions Methods of creating figures without the use of measuring tools.
Created by: 20kcaw08
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