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