Réponses

2014-04-17T13:17:42+02:00
A/

perimetre = 4 x cote  = 4x11/5 =44/5
air = cote² = (11/5)² =11/5 x11/5 = 121/25

b /
perimetre rectangle = 2 (longueur +largeur) = 2 (3/4+5/12) = 2(9/12+5/12) = 2 (14/12) =
2 (7/6) = 14/6 = 7/3

air = longueur  x largeur = 3/4 x 5/12 = 15/48 = 5/16