tolong jawab soal nomer satu aja pakai cara ya!!!

V. Prisma = luas alas × t
= 1 /2 × 18cm × 9 cm× 20 cm
= 9 cm × 9 cm × 20 cm
= 81 cm ² × 20 cm
= 1.620 cm kubik
Semoga membantu ^-^