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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