28 Le triangle DEF est une réduction dans le rapport k du triangle ABC.
E
С
F.
1,2 cm
100°
2,1 cm
B
A
2,8 cm
D
1. a. Calculer le rapport k de réduction.
b. Calculer la longueur du segment [EF].
c. Donner la mesure de l'angle DEF.
2. Le triangle ABC est un agrandissement de rapport
k'du triangle DEF. Donner la valeur exacte de k'.

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