Réponse :
a.
Aire = Longueur x largeur = 6 x 12 = 72 cm2
b.
Triangle ADE
8 x 6 = 48
48 : 2 = 24 cm2
Triangle BCE
4 x 6 = 24
24 : 2 = 12 cm2
c.
72 - 24 - 12 = 36 cm2
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Réponse :
a.
Aire = Longueur x largeur = 6 x 12 = 72 cm2
b.
Triangle ADE
8 x 6 = 48
48 : 2 = 24 cm2
Triangle BCE
4 x 6 = 24
24 : 2 = 12 cm2
c.
72 - 24 - 12 = 36 cm2