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caylus
Hello,

Here i am using vectors

[tex]\vec{AB}=\vec{DC}=3\vec{i}+3\vec{j}[/tex]
==> AB//DC and AD//BC (definition of a translation)


The quadrilater ABCD is a parallelogram:
so
1) his diagonals have the same length;

2) his diagonals are cutting in the middle.

(these are proprieties of a parallelogram)

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