Mathematics

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