Math Crossword puzzle

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Across
  1. 1. something that is accepted through a series of truths.
  2. 5. a quadrilateral with 2 parallel sides
  3. 6. having a degree of 3.
  4. 7. Sound reasoning and the formal laws of reasoning.
  5. 8. stopping after some time in decimals.
  6. 10. looks like a slightly flattened circle and is also known as a plane curve.
  7. 11. a measure to see how heavy something is.
  8. 15. famous mathematician.
  9. 16. sum divided by count.
  10. 17. 2 rays sharing the same vortex.
  11. 18. father of geometry.
  12. 20. famous for his number "1729".
  13. 24. A trigonometric function of an angle.
  14. 25. a polynomial having degree of 4.
  15. 26. A line segment that connects two vertices
  16. 27. appears most often in any given situation.
  17. 29. a proven statement.
  18. 30. middle number in a set of numbers.
Down
  1. 2. a repeating set of decimals.
  2. 3. take one letter away from me and I become even.
  3. 4. Perimeter of a circle
  4. 9. something that deals with variables and constants.
  5. 12. having a degree of 2.
  6. 13. a line segment joining two points on a circle.
  7. 14. an open curve whose points are equidistant.
  8. 15. number being added.
  9. 19. a value that doesn't change.
  10. 21. Term meaning "all the same".
  11. 22. having a degree of 1.
  12. 23. this triangle is equal on all sides.
  13. 28. a straight line that touches a curved surface.