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B is between A and C if and only if A, B, C are distinct collinear points and AB + BC = AC
Set of points consisting of two points on a line, called endpoints , and all points on the line between the endpoints
Ray whose endpoint is the vertex of the angle and it divides the angle into 2 congruent angles
Two angles who share a common vertex, common side (ray), but no common interior points
A closed figure in a plane that is the union of line segments such that the segments only intersect at their endpoints and no segments sharing a common endpoint are collinear.
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