Unit 1 Concept 3: Segments, Rays, Parallel Lines, & Planes

Vocabulary for Chapter 1 Section 3 (Prentice Hall)
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segment
part of a line consisting of two endpoints and all points between them
ray
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 (always form a line)
parallel lines
coplanar lines that do not intersect
skew lines
noncoplanar lines (not parallel and do not intersect)
parallel planes
planes that do not intersect
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