volume d'un solide = aire base x hauteur
a)
aire base carré = 2x2 = 4 cm²
volume = 4 x 2 = 8 cm³
b)
aire base rectangle = 3 x 7 = 21 cm²
volume = 21 x 5 = 105 cm²
c)
aire base triangle = 1/2 x 4 x 3 = 6 cm²
volume = 6 x 5 = 30 cm³
et
d)
aire base cercle = pi x r² = 3,14 x 3² = 28,26 cm²
volume = 28,26 x 10 = 282,60 cm³
