Geometry Fundamental Vocabulary

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Across
  1. 2. The rays that make up the angle
  2. 4. A real number on the number line
  3. 6. A measurable part of a line that consists of 2 points, called endpoints
  4. 8. An angle whose measure is exactly 180°; also known as a line
  5. 10. Points that lie on the same plane
  6. 12. A unit of measure used to measure angles; when a half-circle is divided into 180 parts
  7. 14. A figure formed by 2 rays with a common endpoint known as a vertex; divides a plane into 2 regions; interior and exterior
  8. 15. Two angles whose measures have a sum of 180°; each angle is the supplement of the other
  9. 19. Thought of as a location on a plane with neither shape nor size
  10. 20. A point where the edges of a figure intersect
Down
  1. 1. The point that divides a segment into 2 congruent parts
  2. 3. Points that lie on the same line
  3. 4. Two angles whose measures have a sum of 90°; each angle is the complement of the other
  4. 5. A point or set of points geometric figures have in common
  5. 7. An angle whose measure is greater than 90°
  6. 9. Made up of an infinite number of points, extends infinitely and is straight with no thickness; NEED MINIMUM of 2 points
  7. 11. A part of a line that starts at an endpoint and continues infinitely in one direction
  8. 12. The length of a segment between 2 points
  9. 13. Figures that are the same size and shape
  10. 16. Flat surface made up of an infinite number of points that extends infinitely in all directions; NEED MINIMUM of 3 points
  11. 17. The measure between 2 points on a number line; |a-b| or |b-a|
  12. 18. An angle whose measure is less than 90°
  13. 21. An angle whose measure is exactly 90°