First thing you need to know is about the different types of lines:
Segment- a subset of a line that contains two points of the line and all points between those two points
Ray- a subset of a line that extends forever in one direction
Line- has no thickness and extends forever in two directions
Collinear Points- points that fall on the same line
Intersecting Lines- lines with exactly one point in common
Parallel Lines- coplanar lines thast have no points in common represented as C // D
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