Mathematics CROSSWAY

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Across
  1. 1. Father of Mathematics
  2. 7. The number of zeroes are in One Billion
  3. 8. Person who Discovered Zero(0)
  4. 9. What is 2 in the equation 2x+3=9?
  5. 10. The smallest Perfect Number
  6. 11. Number of sides in a decagon
Down
  1. 2. Father of Trigonometry
  2. 3. Multiplicative inverse of a fraction
  3. 4. Longest side of a right-angled triangle
  4. 5. Largest chord of a circle
  5. 6. The only number that cannot be used as a divisor
  6. 9. Location where Abacus was invented