Bonjour;

volume cylindre

r = 30/2 = 15

3,14*15²*40 =>28 260cm³

volume 1/2 boule

[(4*15³ *3,14)/3]/2 = 7 065cm³

total:

28 260 + 7 065 => 35 325cm³

1 000plots

35325*1 000 =35 325 000 cm³ = 35,325m³