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Chapter 1 Vocabulary


Has no dimensions and is represented by a dot Point
A line that consists of two endpoints and all of the points in between Line Segment
It has two dimensions and resembles a floor or wall. It extends without end in all directions. Plane
Has one dimension and is represented by a line with two arrowheads, but it extends without end Line
Points that lie on the same line Collinear Points
Points that lie on the same plane Coplanar Points
The point or the set of points two or more figures have in common Intersection
Consists of one endpoint and goes on in one directions without ending Ray
A rule that is accepted without proof Postulate or Axiom
The real number or numbers that corresponds to a point Coordinate
The absolute value of the difference between two coordinates Distance
Line segments that have the same length Congruent Segments
The point that divides the segment into two congruent segments Midpoint
A point, ray, line, line segment, or plane that intersects the segment at its midpoint Segment Bisector
Two different rays with the same endpoint Angle
Each ray of an angle Sides of Angles
The endpoint of an angle Vertex of Angles
The absolute value of the difference between the real numbers measured on a protractor Measure of Angle
An angle that measure between 0° and 90° Acute Angle
An angle that measure exactly 90° Right Angle
An angle that measure between 90° and 180° Obtuse Angle
An angle that measures exactly 180° Straight Angle
Two or more angles that have the same measure Congruent Angles
A ray that divides an angle into two angles that are congruent Angle Bisector
The sum of two angles equals 90° Complementary Angles
The sum of two angles equals 180° Supplementary Angles
Two angles that share a common vertex and side, but have no common interior points Adjacent Angles
Two adjacent angle and their common sides are opposite rays Linear Pair
Two angles whose sides form two pairs of opposite rays Vertical Angles
A closed plane figure formed by three or more line segments and each side intersects two sides one at each endpoint. Two Properties of Polygons
The endpoint of each side of a polygon Vertices of Polygons
Determined by the number of sides “n-gon” Naming Polygons
A polygon that contains no point in the interior of the polygon Convex Polygon
A polygon that contains a point in the interior of the polygon Concave Polygon
All sides are congruent Equilateral
All angles in the interior of the polygon are congruent Equiangular
A convex polygon that is both equilateral and equiangular Regular Polygon
3-sided polygon Triangle
4-sided polygon Quadrilateral
5-sided polygon Pentagon
6-sided polygon Hexagon
7-sided polygon Heptagon
8-sided polygon Octagon
9-sided polygon Nonagon
10-sided polygon Decagon
12-sided polygon Dodecagon
Distance around a figure Perimeter
Distance around a circle Circumference
Amount of surface covered by a figure Area
A chord that passes through the center of a circle Diameter
A segment whose endpoints are the center of the circle and a point on the circle Radius
Created by: warnockj