Point, A location and has no size., Line, An infinite number of points on a straight path that extends in two opposite directions with no end and has no thickness. , Plane, An infinite number of points and lines on a flat surface that extends without end and has no thickness., Collinear, Points that lie on the same line., Coplanar, Points that lie on the same plane., Line segment, Part of a line that consists of two endpoints and all the points between., Ray, Part of a line that consists of one endpoint and all the points on one side of the endpoint., Opposite rays, Rays with the same endpoint that lie on the same line., Angle, Formed by two rays with the same endpoint. Each ray is a side of the angle and the common endpoint is the vertex of the angle., Congruent segments, Segments with the same length., Midpoint, Point dividing a segment into two congruent segments., Segment bisector, A segment, ray, line, or plane that passes through the midpoint of a segment., Complementary angles, Two or more angles whose sum is 90 degrees., Supplementary angles, Two or more angles whose sum is 180 degrees., Adjacent angles, Two angles that share a common side and a common vertex., Vertical angles, Two nonadjacent angles formed by two intersecting lines. *CONGRUENT*, Congruent angles, Two angles that have the same measurement., Angle bisector, A ray in the interior of an angle that splits the angle into two congruent angles..

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