Thebault's theorem
Construct squares on the sides of a parallelogram ABCD. Then the centers of these squares are vertices of a square. Look at the file
Van_Aubel.html
for a related figure.
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Thebault's theorem ![[0_0]](Thebault_files/Thebault_0_0_0.png)
![[0_1]](Thebault_files/Thebault_0_0_1.png)
![[1_0]](Thebault_files/Thebault_0_1_0.png)
![[1_1]](Thebault_files/Thebault_0_1_1.png)