1) nature : triangle rectangle
aire = L x (l/2)
calcul = 4 x (3/2) = 6cm²
2) Nature : carré
périmètre = coté x 4
calcul = 7 x 4 = 28cm
nature : cercle
aire = pi x (R)²
calcul=pi x (2.5)² = 19.625dm²
nature : cône
volume = (pi/3) x (R)² x h
calcul = (pi/3) x (2.8)² x 5.3 = 43.5cm³
nature : pavé
volume=L x l x h
calcul = 6 x 3 x 4 = 72cm³
nature : cylindre
volume = pi x (R)² x h
calcul = pi x (2.5) x 10 = 196.25cm³
