Math revision

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Across
  1. 2. a one-sided opinion
  2. 6. calculations with variables
  3. 8. half of Diameter
  4. 9. calculating 2 or more events probability
  5. 10. a space of all the possible outcomes
  6. 14. The addition of number
  7. 15. Events that are not been experimented on
  8. 18. the exterior length of a circle
  9. 19. 3.1415926535
  10. 20. the chance of an event happening
Down
  1. 1. theorem a2+b2=c2
  2. 3. numbers that can be square rooted perfectly
  3. 4. estimating the chances after an experiment
  4. 5. the exterior length
  5. 7. the expansion of numbers
  6. 11. √
  7. 12. the number that appear more than once during the expansion of numbers
  8. 13. the line opposite to the right angle
  9. 16. a strong prediction that you want to happen
  10. 17. ∏r2 gives you the area of a______