GEOMETRY

12345678910111213
Across
  1. 4. into the third dimension
  2. 8. how far from one end to the other
  3. 9. point of origin
  4. 11. no space taken
  5. 12. on the same line
  6. 13. infinitely along
Down
  1. 1. halfway there
  2. 2. part of a line
  3. 3. no touchy in the same plane
  4. 4. not crossing not parallel
  5. 5. where the segment stops (or begins)
  6. 6. all the way both ways
  7. 7. makin' a "T"
  8. 10. from point to infinity
  9. 12. on the (same) level