| P2 | P4 | |||
| Given the figure, prove that the QT segment is equal to KN.
| Prove that the area of a square on the diagonal of another square has twice of his area. | |||
| Sub configurations | ||||
| P2 | P2.1
| P2.2
| P2.3
| |
| P4 | P4.1
| P4.2
| ||