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# Geometry-Chapter 1

### Geometry-Chapter 1 Vocabulary

A word that does not have a formal definition, but there is agreement about what the word means. undefined term
Terms that can be described using known words. defined terms
A figure that has no dimension, is usually represented by a dot. It is one of the undefined terms. point
A figure that has two dimensions and is usually represented by a shape similar to a wall or floor, It is one of the undefined terms. plane
A figure that has one dimension and is usually represented by a straight line with two arrowheads to indicate it extends without end in two directions. It is one of the undefined terms. line
Points that lie on the same line. colinear
Points that lie on the same plane. coplanar
Part of a line that consists of two points called endpoints, and all points on the line that are between the endpoints. line segment
A place where something ends or is complete. endpoint
Part of a line that consists of a point called an endpoint and all points on the line that extend in one direction. ray
Two rays that lie on the same line, share a common endpoint but extend in opposite directions. opposite rays
The set of all points that two or more geometric figures have in common. intersection
A rule that is accepted without proof. postulate
The real number that corresponds to a point on a line. coordinate
The absolute value of the difference of the coordinates of the points. distance between two points
Line segments that have the same length. congruent segments
The point that divides or bisects a segment into two congruent segments. midpoint
A point, ray, line, line segment, or plane that intersects a segment at its midpoint. segment bisector
Consists of two different rays with the same endpoint angle
The endpoint of an angle. vertex
A ray that divides an angle into two angles that are congruent. angle bisector
Two angles that have the same measure. congruent angles
An angle measuring between 0 and 90 degress. acute angle
An angle measureing 90 degrees. right angle
An angle measuring between 90 and 180 degrees. obtuse angle
An angle measuring 180 degrees. straight angle
Two angles whose measures have the sum of 90 degrees. complementary angles
Two angles whose measures have the sume of 180 degrees. supplementary angles
Two angles that share a common vertex and side, but have no common interior points. adjacent angles
Two adjacent angles whose noncommon sides are opposite rays. linear pair
Two angles whose sides form two pairs of opposite rays. vertical angles
A closed plane figure with the following properties: 1. It is formed by three or more line segments called sides. 2. Each side intersects exactly two sides, one at each endpoint, so that no two sides with a common endpoint are collinear. polygon
A polygon such that no line containing a side of the polygon contains a point in the interior of the polygon. convex
A polygon that is not convex. concave
A polygon with "n" number of sides. n-gon
A polygon with all of its sides congruent. equilateral polygon
A polygon with all of its interior angles congruent. equiangular polygon
A polygon that has all sides and all angles congruent. regular polygon
The distance around the outside edge of a flat object. perimeter
The amount of surface covered by a figure. area
The distance across a circle through its center. diameter
The distance from the center of a circle to any point on the circle. radius
The distance around a circle. circumference
The set of all points. space
A segments whose endpoints are two non-consecutive vertices. diagonal
Created by: aelohaus