Geometry crossword

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Across
  1. 2. 90 degrees
  2. 4. a bar with three points
  3. 7. where a line ends
  4. 10. less than 90 degrees
  5. 12. number of none overlapped square units
  6. 13. figure formed with two rays
  7. 14. sum of the sides
  8. 15. straight thing that goes forever
  9. 18. 180 degrees
  10. 19. line with two ends
Down
  1. 1. the distance from the middle of the circle to the outer part
  2. 3. distance between a and b
  3. 5. if there is just a letter p it's called...
  4. 6. what is between a and c
  5. 8. flat surface
  6. 9. points that land in the same plane
  7. 11. this segment has the same length
  8. 16. more than 90 degrees
  9. 17. starts off the line and then continues forever