Math revision

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