no 4 ya kak tolong dibantu makasi

Digarisin dulu biar jadi 2 bangun ruang, balok sama prisma segitiga

Liter = dm³

Volume balok = 50m x 1,2m x 9m = 500dm x 12dm x 90dm = 540.000dm³

Volume prisma = ( (50m-12m) x (2,8m-1,2m) / 2) = ( 38m x 1,6m / 2) = ( 380dm x 16dm / 2) = (6080/2) = 3040dm²
Luas alas x tinggi :
3040dm² x 9m = 3040 x 90dm = 273.600dm³

V balok + V prisma = 813.600dm³