Math revision

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