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= 80 + 60 ( 80 itu luas persegi panjang dan 60 itu luas 2 segitiga)
= 140
V prisma =La x t
= 140 × 6
= 840
= 2 * luas trapesium
= 2 * ( jumlah sisi yang sejajar * t / 2)
= 2 * ((8 + 20) * 5 / 2)
= 2 * (28 * 5 / 2)
= 2 * 14 * 5
= 140 cm²
volume = luas alas * tinggi
= 140 * 6
= 840 cm³