No. | Three closest points | Determinants | Inside or outside the triangle | Recommend or not |
15 | 13, 16, 10 | ; ; | Outside | No |
11 | 13, 9, 14 | ; ; | Inside | Yes |
5 | 3, 8, 10 | ; ; | Outside | No |
8 | 10, 6, 11 | ; ; | Inside | Yes |
17* | 7, 2, 4, | ; ; | Outside | No |
18* | 13, 11, 8 | ; ; | Inside | Yes |