Across
- 2. The golden ratio
- 4. The product of an integer and all the integers below it. (!)
- 7. The longest side of a right triangle
- 10. A plane figure with nine straight sides
- 12. A number that is left over
- 15. Divide into two equal parts
- 16. No quantity or number
- 17. Making contact at a single point or along a line
Down
- 1. A part of a number
- 3. The result of subtraction
- 5. It links two points
- 6. Of or denoting circles that share the same center
- 8. The center of mass of a geometric object of uniform density
- 9. The exact middle point
- 11. A solid that has six rectangular faces at right angles to each other
- 13. The space between two intersecting lines where they meet
- 14. A number that is not a fraction