Illuminati's Crossword

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Across
  1. 5. The ratio of circumference of a circle to .... is'pi'
  2. 6. Father of Mathematics
  3. 7. Which number appears the most in first 6 billion decimal places of 'pi'
  4. 9. 'pi' is described as a ..... number.
Down
  1. 1. Number of digits in 'pi'
  2. 2. Number that doesnot exist in first 31 digits of 'pi'
  3. 3. Who calculated circumference of circle and found value of 'pi' as 22/7
  4. 4. Scientist born on 'pi' day
  5. 8. Discovered the value of 'pi'