math cross word puzzle

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Across
  1. 1. inside the lines
  2. 3. one endpoint
  3. 5. outside the lines
  4. 8. inverse of the number
  5. 10. single location
  6. 11. horizontal or vertical number that shows a coordinate-plane formed by two number lines
  7. 12. rays that cross to make right angels
  8. 13. number with parentheses which is multiplied
  9. 15. sum is 180
  10. 16. form of an object
  11. 17. letter to show unknown number
  12. 19. never meet
  13. 20. same size and shape
  14. 21. transformation that turns in a given direction around a fixed point
Down
  1. 2. line that intersects
  2. 4. transformation where size and don't change
  3. 6. moves same distance and direction
  4. 7. figure formed by two rays
  5. 9. pair of numbers
  6. 14. mirror image
  7. 17. highest point
  8. 18. 2d figure amount of space