# Morphing squares

Morphing one square to another :
Let P and Q moving proportionally on D'B and B'D.
When P goes from D' to B, the square C'D'AB' becomes ABCD.
As there is a common vertex, the points O and O' describe the diagonal C'A and AC.
When P is at the middle of D'B, Q is at the middle of B'D, O at the middle of C'A and O is at the middle of AC.
Moins

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