Maths vocabulary crossword puzzle

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Across
  1. 2. When a curve is going up
  2. 5. a geometric tool with a right angle
  3. 6. a function with an x squared
  4. 10. the top of a fraction
  5. 12. they are only ten existing
  6. 14. datas coming from the population, and are gathered together
  7. 16. the half of a diametre
  8. 17. a suit of values
  9. 18. to remove an unknown value
  10. 19. a portion of something
  11. 20. the slope of the curve
Down
  1. 1. a draw which represents a situation
  2. 3. switch an element by another one
  3. 4. a parameter in volumic solids
  4. 7. a parallelogram with the same edges 2 by 2
  5. 8. absissa linked with ordinates of a point
  6. 9. an unreal number
  7. 11. the straight line which touches a single point of a curve
  8. 13. represents the top of a curve
  9. 15. to develop an expression