pi day

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Across
  1. 2. someone who teaches math
  2. 4. the length of a closed circle
  3. 8. a small part of a number
  4. 10. lacking purpose
  5. 11. a number with a fixed value
  6. 14. the length of a straight line through the center of a circle
  7. 18. existing outside of nature
  8. 20. the mathematic lines and curves
Down
  1. 1. numerical quantity
  2. 3. any number
  3. 5. the magnitude of two numbers
  4. 6. a mathmatical statement
  5. 7. to do a arithmetic equation
  6. 9. going on for ever
  7. 12. 3.14
  8. 13. real but not expressible
  9. 15. a rough calculation
  10. 16. a proper fraction whose denominator is a power of 10
  11. 17. a straight line through a circle
  12. 19. one of the element that form up a numeration