Bonjour,
a)
4/3 * π * x³
b)
20mm = 2cm
4/3 * π * 2³
(4*3,14 *2³) /3
=>3,40cm³
c)
(4*3,14 *3,2³ )/3
=>137,19 cm³
d)
(4*3,14 *3,7³ )/3
=> 212,07 cm³
