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Euclide: énoncée 3, 4 et 5
Énoncé 3 : Les côtés opposés d’un parallélogramme sont isométriques.
Énoncé 4 : Les diagonales d’un parallélogramme se coupent en leur milieu.
Énoncé 5 : Les angles opposés d’un parallélogramme sont isométriques.