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Chapter One Vocab
Definitions from Chapter One
25
Mathematics
10th Grade
11/09/2010

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Term
Point
Definition
Smallest unit in geometry; can represent a location/vertex.
Term
Line
Definition
Collection of pts that extend forever in two opposite directions.
Term
Ray
Definition
A collection of pts that extend forever in one direction.
Term
Segment
Definition
Collection of points between two end points.
Term
Plane
Definition
Flat surface that extends forever in all directions.
Term
Equidistance
Definition
Two points the same distance from a third point.
Term
Congruent
Definition
Two shapes that are the exact same.
Term
Equal
Definition
Two numbers having the same value.
Term
Collinear
Definition
Two or more points on the same line.
Term
Coplaner
Definition
Three or more points on the same plane.
Term
Parallel
Definition
Lines/planes that never touch and are going in the same direction.
Term
Scew lines
Definition
Lines in different planes that never touch and go in different directions.
Term
Interesecting
Definition
Lines/planes that touch at a point/line.
Term
Theorem
Definition
A rule we know is true
Term
Postulate
Definition
A rule we assume is true.
Term
Midpoint
Definition
The point that is equidistance from end points of a line segment.
Term
Angle
Definition
Two rays that share an end point.
Term
Vertex
Definition
Where rays meet.
Term
Acute Angle
Definition
Measures between 0-90 degrees.
Term
Obtuse Angle
Definition
An angle between 91-180 degrees.
Term
Straight Angle
Definition
An angle measuring exactly 180 degrees.
Term
Right Angle
Definition
An angle that measures exactly 90 degrees.
Term
Zero Angle
Definition
An angle measuring exactly 0 degrees.
Term
Bisector
Definition
Cuts an object into two congruent parts (angle, segment)
Term
Adjacent Angles
Definition
Angles that share the same vertex and side but not interior pts on a plane.
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