All about maths

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Across
  1. 4. Non-numerical data
  2. 5. The fraction obtained when numerator and denominator are interchanged
  3. 7. Another name for metric system
  4. 10. Teachers granddaughter
  5. 12. Same sides and same shape
  6. 14. The initial amount invested
  7. 16. Method to find the gradient function
  8. 18. The amount a container can hold in litres
  9. 22. The length of a vector
  10. 23. This average uses all the data
  11. 24. Not recurring or terminating
  12. 27. Set of objects that are not in a set but are part of a larger universal set
  13. 28. Formula connecting the 3 sides of a triangle and one of its angles
Down
  1. 1. One of his inventions started by observing a fly on his ceiling.
  2. 2. A plane shape that forms part of a solid
  3. 3. Aka delta
  4. 6. The surd that you multiple the denominator by to rationalise it
  5. 8. Meet at 90 degrees
  6. 9. A quantity that has magnitude and direction
  7. 11. This average occurs the most
  8. 13. 2,3,5,7...
  9. 15. Standard Index Form
  10. 17. A line that a graph approaches but never intersects
  11. 19. His theorem appears in all triangles and circles and not just special triangles
  12. 20. An integer with more than 2 factors
  13. 21. The number of non-overlapping unit cubes contained inside a 3D shape
  14. 25. Two angles that sum to 90 degrees
  15. 26. This average is the middle value