| Clue | Source | Date |
|---|---|---|
| Made up of three-sided figures | The Times Concise | 12 Jan 2022 |
| Made a survey with a baseline and angular measurement | The Times Specialist Sunday | 28 Jun 2020 |
| Surveyed using a grid of three-sided figures | The Times Concise | 11 Sep 2017 |
| Adulterating plastic, it's adapted to a particular form |