Maths, VN and General knowledge

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Across
  1. 6. The vertex of a pyramid where all triangular faces meet
  2. 8. A straight line that touches a curve at one
  3. 10. A line with gradient=0
  4. 13. A polygon with 4 sides
  5. 15. The most abundant element in the Universe
  6. 20. He is the first Vietnamese national to have received the Fields Medal
  7. 22. The metric system
  8. 23. A straight line from the centre to the circumference of a circle.
  9. 24. How many factors does the number 91 have?
  10. 25. The 2D shape when folded creates its 3D shape
  11. 27. A letter in an equation that can have different values.
  12. 30. The largest factor of any natural number
  13. 33. Your maths teachers grandson name.
  14. 34. Something that affects the chance of an event occurring
  15. 35. A cube with faces numbered with dots from 1 to 6
  16. 36. The longest side of a right triangle
  17. 39. A line with undefined gradient
  18. 43. The number of unit cubes in a 3D shape
Down
  1. 1. The graph of a quadratic relationship
  2. 2. Considered the most perfect shape in nature. ( seen in honeycombs and rocks
  3. 3. The most abundant element on Earth
  4. 4. How many factors does the number 360 have?
  5. 5. The "p" in 11pm
  6. 7. In a right triangle: OPP/ADJ
  7. 9. What school does Tue Minh Michelle Ryan attend ?
  8. 11. At right angles to
  9. 12. Plural of radius
  10. 14. Vietnam's national flower
  11. 15. What prison(now a museum) is known as Hanoi Hilton ?
  12. 16. The original position of a point/shape before a transformation
  13. 17. The most common surname in Vietnam
  14. 18. In a right triangle: ADJ/HYP
  15. 19. The plural of a general rule expressed algebraically
  16. 21. En passant is a move in what game?
  17. 26. How many prime numbers are there between 0 and 100?
  18. 28. The number of unit squares in a 2D shape
  19. 29. The steepness of a line.
  20. 31. The capital of Ireland
  21. 32. Vietnam is the world's largest exporter of what type of nuts
  22. 37. The smallest factor of any natural number
  23. 38. Your maths teachers motorbike
  24. 40. A polygon with 4 equal sides
  25. 41. Another word for power or exponent
  26. 42. A plane shape closed by non-intersecting straight lines