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1. Point Dot that names a location and has no size. 2. Line Straight path that extends infinitely in both directions. 3. Plane Flat surface that extends infinitely in all directions 4. Collinear Points that lie on the same line. (2 points are always collinear) 5. Coplanar Things that lie on the same plane. 6. Segment Part of a line with 2 endpoints. 7. Ray Part of a line that starts at an endpoint and extends infinitely in one direction. 8. Angle Figure formed by 2 rays with a common endpoint. 9.Vertex Common endpoint of the sides of an angle or shape Two angles that 10. Adjacent share a Angles common vertex and a common side, but no common interior points. 11. Linear Pair of adjacent Pair angles that together form a straight line. 12. Acute Angle with Angle measure less than 90°. 13. Right Angle Angle with measure equal to 90° 14. Obtuse Angle with Angle measure greater than 90° and less than 180° 15. Straight Angle with Angle measure equal to 180° 16. Complementary Angles Angles whose sum is 90° 17. Angles Supplementary whose sum Angles is 180° 18. Point that Midpoint lies exactly in the middle of a segment. 19. Point that lies Between inside of two other points on a line, segment or ray. 20. Line or point Segment that cuts a Bisector segment into 2 equal parts 21. Angles with Congruent the exact Angles same measure. 22. Angle Ray or line that Bisector divides an angle into 2 equal (congruent) angles.