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
| ||