# 01.01 Basics Of Geometry

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Point
Which undefined term is needed to define an angle? Point Ray Plane Line
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is described generally, not using a formal definition
A plane is an undefined term because it can be named using three noncollinear points is where other geometric shapes can be constructed is described generally, not using a formal definition is a flat surface that extends indefinitely in all directions
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point
generally a location
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Line
a stream of points has no width or depth
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collinear
points that lie on the same line
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Noncollinear
points that do not lie on the same line
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Plane
A flat surface on which a straight line joining any two points would wholly lie.
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Coplanar
points that lie on the same plane
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Noncoplanar
points that do not lie on the same plane
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line segment
part of a line with two endpoints
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ray
A part of a line, with one endpoint, that continues without end in one direction
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vertex
The common endpoint of an angle
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angle
A figure formed by two rays with a common endpoint
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postulate