Happy Pi Day

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Across
  1. 1. Egyptian papyrus with an early pi approximation of 256/81
  2. 3. Half the diameter, used in the formula C = 2πr
  3. 8. What pi multiplied by diameter gives you
  4. 9. The day of March on which Pi Day is celebrated (3/14)
  5. 10. Advanced property of pi proving it can't be solved by algebra alone
  6. 12. The Greek letter symbol for the circle constant
  7. 13. Ancient civilization that approximated pi as about 3.125 on clay tablets
  8. 14. What competitors do with thousands of pi's digits in contests
  9. 15. Famous physicist born on March 14, Pi Day
Down
  1. 2. Description of pi's endless, non-repeating decimal digits
  2. 4. The line through a circle's center that pi divides circumference by
  3. 5. Welshman who first used the π symbol in print in 1706
  4. 6. Pi's classification as a non-repeating, non-terminating decimal
  5. 7. Swiss mathematician who popularized the π symbol in the 1700s
  6. 11. Ancient Greek who approximated pi using polygons around 250 BC