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Geometry Concepts
Geometry Concepts to review before 9th grade
13
Mathematics
8th Grade
05/03/2011

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Cards

Term
Colinear
Definition
Lying in one line (usually refers to a set of points
Term
Congruent
Definition
Of exactly the same size and shape; in other words, of exactly the same dimensions.
Term
Coplanar
Definition
Existing in one plane (usually refers to points or lines
Term
Dimension
Definition
The number of lines required to span a region in space
Term
Line
Definition
A collection of points arrayed in a straight formation without limit
Term
Noncolinear
Definition
Not lying in one line (usually refers to a set of points).
Term
Noncoplanar
Definition
Not existing in one plane (usually refers to points or lines
Term
Perpendicular
Definition
At a 90 degree angle (something is perpendicular relative to something else).
Term
Plane
Definition
A flat, boundless surface in space
Term
Point
Definition
A specific location in space
Term
Ray
Definition
A portion of a line with a fixed endpoint on one end that extends without bound in the other direction.
Term
Segment
Definition
A portion of a line with two endpoints and, thus, finite length
Term
Space
Definition
The collection of all points.
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