tolong dong bantu jawab no 30 ,please!

Diameter = 56
Luas Lingkaran = 22/7 x 28 x 28 = 2464
Tinggi = 197120 : 2464 = 80

MASIH GAK PERCAYA KITA TES LAGI
Luas alas = 2464
Tinggi = 80
Volume = ?
2464 x 80 = 197120

TERBUKTI
Tinggi = 80

diameter = 56 => r = 28 cm
Volume drum = πr^2 t = 197.120
=> 22/7 x 28 x 28 x t = 197.120
=> 2.464t = 197.120
=> t = 197.120/2.464
=> t = 80 cm