Maths puzzle

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Across
  1. 2. class is the class with maximum frequency
  2. 4. is the plural of frustum
  3. 10. is proven statement used for proving another statement
  4. 13. is equal to b^2-4ac
  5. 15. is a list of numbers in which each term is obtained by adding a fixed term to the preceding term
  6. 16. is a Latin word meaning 'piece cut off'
  7. 18. is a series of well defined steps which gives a procedure for solving a type of problem
  8. 20. is the probability of a sure event
  9. 21. is a line hat intersects the circle at only one point
  10. 22. is the portion of the circular region enclosed by two radii and the corresponding arc
  11. 23. theorem in also known as BAsic ProPortionality Theorem
Down
  1. 1. is the probability of an impossible event
  2. 3. is the highest power of x in (p)x
  3. 5. is a work by Aryabhata
  4. 6. formula is the formula used for finding roots of the quadratic equation
  5. 7. was first used be sir George Everest
  6. 8. is the portion of the circular region enclosed between a chord and corresponding arc
  7. 9. museum of the survey of India has a display of theodolite
  8. 11. is the fixed number in an AP
  9. 12. is one of the roots of the cubic polynomial
  10. 14. is pronounced as ogeev
  11. 17. means to touch
  12. 19. means measure