Mathematical Crossword Puzzle

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