Interoperable interactive geometry for Europe
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Le parallelogramme de Varignon

Un quadrilatere etant donne, si l'on joint les milieux des cotes consecutifs, on obtient un parallelogramme. Ce resultat est valable quel que soit le quadrilatere convexe, concave ou croise. Cette activite permet a l'eleve d'apprendre a demontrer.

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