Exercice 11:
1. Faut utiliser les tableaux de proportionalité.
AB = 5.4 + 5.8 = 11.2
AD AE DE 5.4 AE 3.24
___ = ___ = ___ ____ = ____ = ____
AB AC BC 11.2 8.4 BC
AE = 5.4 x 8.4 / 11.2 = 4.05
BC = 3.24 x 11.2 / 5.4 = 6.72
AE mesure 4.05 cm.
BC mesure 6.72 cm.
2.
BD = 6 + 8 = 14
BA BE AE 3.9 6 AE
___ =___ = ___ ___ =___= ___
BC BD CD BC 14 8.4
BC = 3.9 x 14 / 6 = 9.1
AE = 6 x 8.4 / 14 = 3.6
