| Clue | Source | Date |
|---|---|---|
| Circle, ellipse, parabola and hyperbola | Wall Street Journal | 25 Nov 2017 |
| Ellipses and parabolas | ||
| Parabolas, ellipses, etc. | ||
| Parabolas, e.g. | ||
| Geometrical figures | ||
| Parabolas, e.g. | ||
| Ellipses, parabolas, etc. | ||
| Geometric curves | ||
| Theory of a branch of geometry. |