# Shared Flashcard Set

## Details

Chapter 1 Geometry
FlashcardDB
39
Mathematics
10/18/2012

Term
 Point
Definition

 A specific location in space with no size or shape. [image]
Term
 Line
Definition
 A never-ending straight path[image]
Term
 Segment
Definition
 Part of a line containing two endpoints and all the points between them.[image]
Term
 Ray
Definition
 A part of a line that extends indefinitely in one direction from a fixed point [image]
Term
 Plane
Definition
 A two-dimensional flat surface that extends in all directions.[image]
Term
 Opposite Rays
Definition
 Two rays that are part of the same line and have only their endpoints in common. In the figure, [image] and [image] are opposite rays.[image]
Term
 Collinear
Definition
 Three or more points that lie on the same line. In the figure, P, Q, and R are collinear points.

[image]

Term
 Coplanar
Definition
 Points or lines that lie in the same plane. In the plane M, points A, B, and C are coplanar, and [image] and [image] are coplanar.[image]
Term
 Angle
Definition
 A figure formed by two rays with a common endpoint. In the figure, [image]RST is formed by [image] and [image] with the common endpoint (or vertex) S.[image]
Term
 Midpoint
Definition
 On a line segment, the point that is halfway between the endpoints.[image]

Term
 Bisector
Definition
 To separate something into two congruent parts.[image]
Term
 Congruent
Definition
 Having the same measure.[image]
Term
 Vertex
Definition
 The common endpoint of the rays forming the angle.[image]
Term
 Acute Angles
Definition
 An angle with a measure greater than 0° and less than 90°. [image]
Term
 Obtuse Angles
Definition
 An angle that measures more than 90° but less than 180°. [image]
Term
 Right Angle
Definition
 An angle that measures exactly 90°[image]
Term
 Straight Angle
Definition
 An angle that measures 180°.[image]
Term
 Complementary Angles
Definition
 Two angles are complementary if the sum of their measures is 90°. In the figure, [image]1 and [image]2 are complementary angles [image]
Term
 Supplementary Angles
Definition
 Two angles are supplementary if the sum of their measures is 180°. [image]
Term
 Vertical Angles
Definition
 Opposite angles formed by the intersection of two lines. In the figure, thevertical angles are [image]1 and [image]3, and [image]2 and [image]4.[image]
Term
Definition
 Angles that have the same vertex, share a common side, and do not overlap. In the figure, [image]1 and [image]2 are adjacent angles.[image]
Term
 Linear Angles
Definition
Term
 Perpendicular Lines
Definition
 Lines which meet to form right angles and whose slopes have a product of -1.[image]
Term
 Polygon
Definition
 A simple closed figure in a plane formed by three or more line segments. [image]
Term
 Triangle
Definition
 A polygon having three sides.[image]
Term
Definition
 A polygon having four sides.[image]
Term
 Pentagon
Definition
 Polygon with 5 sides[image]
Term
 Hexagon
Definition
 Polygon with 6 sides[image]
Term
 Octagon
Definition
 Polygon with 8 sides[image]
Term
 Decagon
Definition
 Polygon with 10 sides[image]
Term
 Dodecagon
Definition
 Polygon with 12 sides[image]
Term
 N-gon
Definition
 Polygon with n sides[image]
Term
 Concave
Definition
 A polygon for which a point on at least one of its diagonals lies outside the polygon[image]
Term
 Convex
Definition
 A polygon for which all diagonals are located in the interior of the polygon.[image]
Term
 Regular
Definition
 A polygon that has all sides congruent and all angles congruent. [image]
Term
 Irregular
Definition
 A figure that cannot be classified as a single polygon.[image]
Term
 Diagonal
Definition
 A segment joining two nonconsecutive vertices of a polygon [image]
Term
 Side
Definition
 The segments that form a closed figure.[image]
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