Mathematical Crossword Puzzle

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Across
  1. 5. set of ordered pairs
  2. 8. father of trigonometry
  3. 13. one way to graph a function
  4. 14. abscissa
  5. 15. help us know the nature of the roots of a quadratic function
  6. 17. special kind of relation
  7. 18. opposite/hypotenuse
  8. 19. sum of all the values divided by the number of values
  9. 20. opposite/hypotenuse
Down
  1. 1. range
  2. 2. pythagorean theorem
  3. 3. first degree function
  4. 4. polynomial with two terms
  5. 6. father of algebra
  6. 7. roots of the quadratic equation
  7. 9. curved graph
  8. 10. ninety degrees
  9. 11. ordered pair that corresponds to a point in the plane
  10. 12. horizontal in the Cartesian plane
  11. 16. given angle