Easy as Pi (day)

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Across
  1. 3. pi is an _____ number
  2. 4. (4/3)*π*r^3 = _____
  3. 7. The month pi day is celebrated
  4. 10. 4*π*r^2 = _____
  5. 11. The symbol for pi came from the _____ alphabet
  6. 12. π*d = _____
  7. 13. Pi is a mathematical _____
  8. 16. what day is pi day celebrated on?
  9. 17. ≈22/7
Down
  1. 1. The British mathematician who introduced the pi symbol in 1706
  2. 2. Math's most beautiful equation
  3. 5. Famous scientist born on pi day in 1879
  4. 6. Fifth digit of pi
  5. 7. Pi has played a major role in this subject
  6. 8. π*r^2 = _____
  7. 9. Famous scientist that died on pi day in 2018
  8. 13. The shape most closely associated with pi
  9. 14. The length of pi
  10. 15. 2*pi = ?