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