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Chapter 1 Geometry Test Vocabulary
Taylor Gray
38
Mathematics
9th Grade
10/18/2012

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Term
Point
Definition

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

[image]

Term
Line
Definition

line is infinite an length. May have a point on it.

[image]

Term
Segement
Definition

segment is section of a line.

[image]

Term
Ray
Definition

A ray is line with one endpoint.

[image]

[image]

Term
Plane
Definition

plane is a flat service infinite in 2 directions.

[image]

Term
Opposite Ray
Definition

Opposite Rays are two rays that are part of the same line and have only their endpoints in common.

[image]

Term
Collinear
Definition
Points are collinear when three or more points that lie on the same line. In the figure, PQ, and R are collinear points.

[image]

Term
Coplanar
Definition

Lines or points are coplanar when they are found on the same plane.

[image]

Term
Angle
Definition
A angle is 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

A midpoint is the center of a line segment

[image]

Term
Bisector
Definition
A bisector separates something into two congruent parts.

[image]

Term
Congruent
Definition
Something is congruent when it has the same measure.

[image]

Term
Vertex
Definition

A vertex is the point where two or more lines meet. 

[image]

Term
Acute Angle
Definition
An acute angle is an angle with a measure greater than 0° and less than 90°.

[image]

Term
Obtuse Angle
Definition
An obtuse angle measures more than 90° but less than 180°.

[image]

Term
Right Angle
Definition

A right angle measures exactly 90 degrees

[image]

Term
Straight Angle
Definition

A straight angle measures 180 degrees.

[image]

Term
Complementary Angles
Definition
Complementary angles have a sum of measures that is 90°. In the figure, [image]1 and [image]2 are complementary angles.

[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. In the figure, thevertical angles are [image]1 and [image]3, and [image]2 and [image]4.

[image]

Term
Adjacent Angles
Definition
Adjacent angles are 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 Pair
Definition
A linear pair is two angles that are adjacent who's angles add to 180. (A and B are a linear pair)
[image] 
Term
Perpendicular Lines
Definition

Perpendicular lines are lines that intersect at right angles.

[image]

Term
Polygon
Definition
A polygon is a simple closed figure in a plane formed by three or more line segments.

[image]

Term
Triangle
Definition

triangle is a polygon with 3 sides

[image]

Term
Quadrilateral
Definition
A quadrilateral is a polygon having four sides.

[image]

Term
Hexagon
Definition

A hexagon is a polygon with six sides and  six angles angles.

[image]


Term
Octagon
Definition

octagon is a polygon with 8 sides and 8 angles.

[image]

Term
Decagon
Definition

decagon is a polygon with 10 sides.

[image]

Term
Dodecagon
Definition

dodecagon is a polygon with 12 sides.

[image]

Term
N-gon
Definition

 

A n-gon is a polygon with n sides.

 [image]

Term
Concave
Definition

A concave polygon for which a point on at least one of its diagonals lies outside the polygon. In the figure, diagonal [image] lies outside polygon JKLMN.


[image]

Term
Convex
Definition
A convex polygon for which all diagonals are located in the interior of the polygon.

[image]

Term
Regular
Definition
A regular polygon has all sides congruent and all angles congruent.

 [image]

Term
Irregular
Definition
irregular polygon does not have congruent sides and angle measurements.[image]
Term
Diagonal
Definition

A diagonal is a segment joining two nonconsecutive vertices of a polygon. In the figure, [image] is a diagonal.

[image]

Term
Side
Definition

side is a segment that forms a closed figure. Or two rays that form an angles.

[image]

Term
Perimeter
Definition

Perimeter is the distance around a close geometric figure

[image]

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