Pi day

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Across
  1. 2. formula for the area of a circle is (pi)(r)^(?)
  2. 7. A turtle.
  3. 8. 3D circle.
  4. 11. the perimeter of the the circle.
  5. 12. pi can be expressed as fraction this number is in the denominator.
  6. 14. pi can be expressed as fraction this number is in the numerator.
  7. 15. pi this this type of number.
Down
  1. 1. pi comes from this language.
  2. 3. the third digit of pi.
  3. 4. the full length of the circle through the middle.
  4. 5. the distance from the center of the circle to the edge.
  5. 6. pi is used to calculate this shape.
  6. 9. what is March 14th.
  7. 10. circles are named by the...
  8. 13. Does Mr. Vogel like the question "How many digits of pi do you know?"