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Chapter 1 Vocab
Flashcard DB
39
Mathematics
9th Grade
10/18/2012

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Term
Point
Definition

A point is a specific location in space with no size or shape.

[image]

Term
Line
Definition

A line is a never-ending straight path.

[image]

Term
Segment
Definition

A segment is a part of a line containing two endpoints and all the points between them.

[image]

Term
Ray
Definition
A ray is a part of a line that extends indefinitely in one direction from a fixed point.[image]
Term
Plane
Definition
A plane is a two-dimensional flat surface that extends in all directions.[image]
Term
Opposite Rays
Definition
Opposite rays are 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
Collinear points are Three or more points that lie on the same line.[image]
Term
Coplanar
Definition
Coplanar are Points or lines that lie in the same plane.[image]
Term
Angle
Definition
An angle is a figure formed by two rays with a common endpoint.[image]
Term
Midpoint
Definition
A midpoint is on a line segment, the point that is halfway between the endpoints.

[image]


Term
 Bisector
Definition
A bisector is ray whose endpoint is the vertex of the angle and is located in the interior of the angle. It separates a given angle into two angles with equal measure.[image]
Term
Congruent
Definition
Congruent is Having the same measure.[image]
Term
Vertex
Definition
The vertex is The common endpoint of the rays forming the angle.[image]
Term
Acute Angles
Definition
An acute angle is an angle with a measure greater than 0° and less than 90°.[image]
Term
Obtuse Angles
Definition
An obtuse angle is an angle that measures more than 90° but less than 180°.[image]
Term
Right Angle
Definition
An right angle is an angle that measures exactly 90°.[image]
Term
Straight Angles
Definition
A straight angle is an angle that measures 180°.[image]
Term
Complementary Angles
Definition
Complementary angles are two angles are complementary if the sum of their measures is 90°.[image]
Term
Supplementary Angles
Definition
Supplementary angles are two angles are supplementary if the sum of their measures is 180°.[image]
Term
Vertical Angles
Definition
Vertical angles are opposite angles formed by the intersection of two lines.[image]
Term
Adjacent Angles
Definition
Adjacent angles are Angles that have the same vertex, share a common side, and do not overlap.[image]
Term
Linear Pair
Definition
Linear Pairs are Two angles that are adjacent and supplementary.[image]
Term
Perpendicular Lines
Definition
Perpendicular lines are lines which meet to form right angles and whose slopes have a product of -1.[image]
Term
Polygon
Definition
A polygon is a simple closed figure in a plane formed by three or more line segments.[image]
Term
Concave Polygon
Definition

A concave polygon is a polygon for which a point on at least one of its diagonals lies outside the polygon.

[image]

Term
Convex Polygon
Definition
A convex polygon is a polygon for which all diagonals are located in the interior of the polygon.[image]
Term
Regular Polygon
Definition
A regular polygon is a polygon that has all sides congruent and all angles congruent.[image]
Term
Irregular Polygon
Definition
 Any polygon that is not a regular polygon. A irregular polygon is a polygon whose sides are not all the same length or whose interior angles do not all have the same measure.[image]
Term
Diagonal
Definition
A diagonal is a segment joining two nonconsecutive vertices of a polygon. [image]
Term
Side
Definition
A side is the segments that form a closed figure.[image]
Term
Perimeter
Definition
 The perimeter is the distance around a closed geometric figure.[image]
Term
Triangle
Definition
A triangle is a polygon having three sides.[image]
Term
Quadrilateral
Definition
A quadrilateral is a polygon having four sides.[image]
Term
Pentagon
Definition
A Pentagon is a polygon with five sides.[image]
Term
Hexagon
Definition
A hexagon is a polygon with six sides. [image]
Term
Octagon
Definition
A octagon is a polygon with eight sides. [image]
Term
Decagon
Definition
A decagon is a polygon with ten sides. [image]
Term
Dodecagon
Definition
[image]A Dodecagon is a polygon with 12 sides. 
Term
n-gon
Definition
A n-gon is polygon with n sides.[image]
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