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Sagot :

Salut !

Ex. 1 :

1) coefficient d'agrandissement = EG/AC = 135/75 = 1,

   donc  EF = AB × 1,8 = 30 × 1,8 = 54 cm

2) aire EFGH = aire ABCD × 1,8² = 1 850 × 1,8² = 5 994 cm²

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