Pi Day Crossword Puzzle

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Across
  1. 2. The type of letter the pi is.
  2. 3. Pi is the _________ letter in the Greek alphabet.
  3. 8. Another way to determine the circumference of a circle is by using this.
  4. 9. Another type of number pi is.
  5. 11. Pi is a mathematical ________.
  6. 12. One way to determine the circumference of a circle is by using this.
  7. 13. A Greek mathematician who accomplished the computation of pi.
  8. 15. One type of number pi is.
  9. 17. The distance around a circle.
  10. 20. The British mathematician who introduced the symbol of pi in 1706.
Down
  1. 1. Another field of math pi is used in.
  2. 4. One of the earliest references to pi was by these people.
  3. 5. Pi is used to determine the ____ of a circle.
  4. 6. Pi is the _____ of the circumference of a circle to its diameter.
  5. 7. One field of math pi is used in.
  6. 10. Pi is used in a formula with the radius of a sphere in a _______ area.
  7. 14. The type of series pi is.
  8. 16. Pi Day is also this German physicist's birthday
  9. 18. Pi cannot be represented exactly by a ________.
  10. 19. The person who adopted pi in 1736.