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What is 1 + 3?
Ch1, Ls 4 Segments, Rays, Parrallel Lines and Planes
the part of a line consisting of 2 endpoints and all points between them
the part of a line consisting of one endpoint and all the points of the line on one side of the endpoint
2 collinear rays with the same endpoint. always form a form
noncoplanar; they are no parallel and do not intersect
coplanar lines that do not intesect
planes that do no intersect