mathematics puzzle

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Across
  1. 4. the coordinate are (0,0)
  2. 6. is the longest side
  3. 9. polynomial
  4. 13. solutions
  5. 14. cant be expressed as a fraction
  6. 15. equal distant to each other
  7. 16. point of a straight line
  8. 17. is the y- coordinate
  9. 19. is the quadrilateral
  10. 20. single term
Down
  1. 1. solutions
  2. 2. centre of a circle that inscribes a triangle
  3. 3. angle
  4. 5. set of two or more equations
  5. 7. u shaped curve
  6. 8. many solutions
  7. 10. triangle
  8. 11. can be represented by
  9. 12. triangle with all sides equal
  10. 18. distance from y axis