Happy Pi Day

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Across
  1. 2. Who declared March 14 National Pi Day?
  2. 6. A line connecting the center of the circle and one point on the circle
  3. 7. A line connecting two points of a circle and passing through the center of the circle
  4. 9. Which month do we celebrate Pi Day?
  5. 10. What is one kind of pie people eat to celebrate Pi Day?
  6. 13. The letter that stands for a number beginning with 3.14
  7. 14. What is the formula called for pi times diameter?
  8. 15. A 3-dimensional figure from the Greek for globe or ball
  9. 16. The earliest known reference to pi was written by a scribe named _______
Down
  1. 1. Which Greek mathematician discovered pi?
  2. 3. Ancient mathematicians knew the ratio of the circumference to the diameter of any circle was slightly more than what number?
  3. 4. In 1988, a museum in what US city celebrated Pi Day on a large scale?
  4. 5. Pi is the ______ of the circumference and the diameter
  5. 8. Plural for radius
  6. 11. In the first 31 digits of pi, there is no number _____
  7. 12. The famous scientist born on Pi Day
  8. 14. A shape in which we can measure circumference
  9. 16. What is the formula called for pi times radius squared?