Foundations for Geometry

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Across
  1. 5. A straight path that has no thickness and extends forever.
  2. 8. Points that lie on the same plane.
  3. 10. Two rays that have a common endpoint and form a line.
  4. 11. A part of a line that starts at an endpoint and extends forever in one direction.
  5. 12. The point that divides a segment into two congruent segments.
  6. 13. An angle that measures less than 90 degrees.
  7. 15. Two angles whose measures have a sum of 90 degrees.
  8. 17. An angle that measures exactly 180 degrees.
  9. 18. The part of a line consisting of two points and all points between them.
Down
  1. 1. Two angles whose measures have a sum of 180 degrees.
  2. 2. Points that lie on the same line.
  3. 3. A ray that divides an angle into two congruent angles.
  4. 4. An angle that measures more than 90 degrees but less than 180 degrees.
  5. 6. A flat surface that has no thickness and extends forever.
  6. 7. An angle that measures less than 90 degrees.
  7. 9. A figure formed by two rays with a common endpoint.
  8. 14. Names a location and has no size. It is represented by a dot.
  9. 16. A point at one end of a segment or the starting point of a ray.