bonsoir
surface du rectangle = 40*20 = 800 m²
surface du triangle haut = (50 * 30 )/2 = 150/2 = 75 m²
mesure manquante triangle gauche
25² - 20² = 225
longueur = √225 = 15
surface = ( 15 *25) /2 = 187.5 m²
total = 187.5 + 75 + 800 = 1062.5 m²
1062.5 / 100 = 10.625 donc 11 sacs
