Pi Day

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Across
  1. 2. half of a diameter
  2. 3. line that touches one edge of the circle to another
  3. 5. 2 π r2 + 2 π r h formula of __________
  4. 6. 360 degrees
  5. 7. 3.14 is a __________ _________
  6. 9. curcumference is ___________ of a circle
  7. 11. a 3-D shape, whose formulas use (4)pi
  8. 12. pi first used by
  9. 14. value of pi
  10. 15. homophone of pie
Down
  1. 1. r2 h
  2. 4. perimeter of a circle
  3. 8. Pi day
  4. 10. π r2 formual of ____________
  5. 13. pi is an __________ number