Maths puzzle

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Across
  1. 3. The root sign is also known as________________sign
  2. 5. There are______________many real numbers
  3. 8. _______________made the discovery of zero
  4. 9. 0 is always placed at the_______________on the number line
  5. 10. Pythagoras theorem can only be applied on________________angle triangle
Down
  1. 1. A polygon with 10 sides is known as ______________
  2. 2. All the integers,rational number,irrational numbers,whole numbers and natural numbers come under the category of ____________numbers
  3. 4. 6859 is the______________of 19
  4. 6. ______________is denoted by 'Z'
  5. 7. We can factorise a term by splitting the middle term or__________________theorem