bonjour,
(Pir² -h)/3
pi = 3,14
r = 9,1/2 = 4,55
r² = 4,55 *4,55 = 20, 70
h = 17-9 = 8
=>
(3,14 *20,70 *8)/3 = 519,99/ 3 => 173, 33cm³