| Giver | Post | Date |
| beingcrazysm | GRE Math Challenge #17-The horizontal lines are parallel | 18-Sep-2021 |
| RheaChandrachud | GRE Math Challenge #17-The horizontal lines are parallel | 07-Sep-2021 |
| 13divyasha | GRE Math Challenge #17-The horizontal lines are parallel | 09-Sep-2014 |