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Across
  1. 4. Famous scientist that died on pi day in 2018
  2. 5. 3.14 mirrors
  3. 8. pi has played a major role in this subject
  4. 9. The distance around a circle
  5. 11. pi is the ____th letter of the Greek alphabet
  6. 15. The number of digits pi has
  7. 17. The distance across a circle through the center
  8. 18. It's my day!
  9. 19. A comparison of two numbers
  10. 20. The first digit of pi
  11. 21. Proved pi is transcendental
Down
  1. 1. pi is the ratio of a ______'s circumference to its diameter
  2. 2. The British mathematician who introduced the pi symbol in 1706
  3. 3. Swiss mathematician and physicist credited for popularizing the use of the pi symbol
  4. 6. The month pi day is celebrated
  5. 7. Famous mathematician who closely approximated pi around 250 BC
  6. 10. Famous scientist born on pi day in 1879
  7. 12. pi is an _______ number
  8. 13. Double pi
  9. 14. pi is a mathematical ______
  10. 16. The symbol for pi came from the _____ alphabet