Basic Notions

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Across
  1. 7. are points on the same line
  2. 9. is the union of two distinct rays that share only an endpoint
  3. 11. are angles that share a common vertex, but whose interiors do not overlap
  4. 12. is the set of all points in a plane that are the same distance from a given point
Down
  1. 1. is an angle that measures greater than 90 degrees but less than 180 degrees
  2. 2. are lines in the same plane
  3. 3. are lines in the same plane but do not intersect
  4. 4. is an angle that measures exactly 180 degrees
  5. 5. is an angle that measures less than 90 degrees
  6. 6. are points in the same plane
  7. 8. is an angle that measures exactly 90 degrees
  8. 10. are lines that cannot be contained in a single plane