tolong dibantu ya yg nomor 40 caranya bagaimana

Bab Bangun Ruang
Matematika SMP Kelas VIII

prisma alas trapesium
volume = 1/2 x t x jumlah sisi sejajar x tprisma
volume = 1/2 x 12 x (1 + 1,8) x 5
volume = 30 x 2,8
volume = 84 m^3
volume = 84 x 1.000
volume = 84.000 liter

a = 1m
b = 1,8m
t = 12m
t. Prisma = 5m

Volume = (a + b) × t / 2 × t. Prisma
Volume = (1 + 1,8) × 12 / 2 × 5
Volume = 2,8 × 6 × 5
Volume = 84 m^3
Volume = 84 x 1.000
Volume = 84.000 dm^3
Volume = 84.000 liter