Pi Day

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Across
  1. 5. Number that can't be expressed as a fraction
  2. 6. Round shape
  3. 8. Field involving experiments and observation
  4. 9. Discipline involving algebra and geometry
Down
  1. 1. Without duplication
  2. 2. Line through a circle's center
  3. 3. Proportional relationship
  4. 4. Distance around a circle
  5. 7. Number with digits after the point