MATHS

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Across
  1. 4. Unknown value represented by a letter.
  2. 6. A balanced state.
  3. 10. The coordinate (0,0).
  4. 12. Line touching a curve at one point.
  5. 14. Connection between vertices.
  6. 15. Result of multiplication.
  7. 16. Pattern of shapes that fit perfectly without gaps
  8. 17. A 160-year-old, unsolvable conjecture.
Down
  1. 1. A corner or node.
  2. 2. Rate at which a function changes.
  3. 3. One of four sections of a Cartesian plane.
  4. 5. A number sequence where each term is the sum of the two before.
  5. 7. The greatest value of numbers yet.
  6. 8. Longest side of a right-angled triangle.
  7. 9. The numerical factor multiplying a variable.
  8. 11. Distance from the centre of a circle to its circumference.
  9. 13. Numbers divisible only by 1 and themselves.