[alogo] Squares through 4 points

The 6 squares with sides (or their prolongations) passing through four given poins A, B, C, D. The construction is done using the tool of scheme-sockets.

[0_0] [0_1] [0_2]
[1_0] [1_1] [1_2]
[2_0] [2_1] [2_2]


The construction method through scheme-sockets is exposed in the file: Squares_through.html

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