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14Segments, Rays, Parallel Lines and Planes
Objectives: Identify segments and rays.Recognize parallel lines.
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Identifying Segments & Rays
Part 1
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Segment: The part of a line consisting of two endpoints and all points between them.
Ray: The part of a line consisting of one endpoint and all the points of the line on one side of the endpoint.
Opposite Rays: Two collinear rays with the same endpoint. (Opposite rays always form a line.)
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Recognizing Parallel FiguresPart
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Lines that do not intersect may or may not be coplanar.
Coplanar Noncoplanar
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Parallel Lines: Coplanar lines that do not intersect.
Skew Lines: Noncoplanar lines. (They are not parallel and they do not intersect.)
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J I
N
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Parallel Planes: Planes that do not intersect.(A line and a plane that do not intersect are also parallel.)
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Homework:page 25
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