Réponses

2014-05-18T18:45:32+02:00
L'aire d'un triangle = Base*hauteur /2
a. A= 1.2 dm * 6 cm/2 = 12cm * 6 cm /2 = 72/2=36cm²
b. A= 16cm * 9cm / 2 = 144/2 = 72 cm²
c. A= 18cm * 2cm /2 = 36/2 = 18cm²