Plane - any two dimensional flat surface, Point - a dot on a plane, Line - goes through any two points on the plane and goes to infinity in both directions with new endpoints, Point of intersection - where two lines cross over or overlap each other, Line segment - is a piece of a line between two distinct endpoints, Collinear - Points on the same line, Ray - a line that starts at one point and continues to infinity through a second point, Parallel lines - two lines that always run alongside each other, always the same distance apart and never intersect, Perpendicular lines - two lines that intersect at a 90 degree angle,

Geometry: Lines

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