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= 2 (a + b * t / 2) + (10 + 12 + 17 + 18) * 10
= 2 (12 + 18 * 10 / 2) + 57 * 10
= 2 (30 * 5) + 570
= 2 * 150 + 570
= 300 + 570
Lp. Prisma = 870 cm²