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Sagot :

Aire ABE = AE x AB
Et aire BCDE = aire(ABCD)-aire(ABE)
Ensuite
a) Aire(ABE) = 1 x 3 = 3 cm2
Aire (BCDE) = 3 x 4 - 3 = 9 cm2
b) Aire (ABE) = 3 x 3 = 9
Aire (BCDE) = 12-9 = 3

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