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On considère les points A(2;√2),B(1;-2), C(-√2;1+√2) et D(-1-√2;−1)
2) Calculer les longueurs AB,BD,CD et AD
3) Peut-on alors conclure sur la nature du quadrilatère ABDC ?
4) Quelles sont les deux longueurs à calculer pour pouvoir conclure? Vérifier.
5) Déterminer les coordonnées du centre du quadrilatère ABCD.

Sagot :

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