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= 2 (a * t / 2) + (12 + 5 + 13) * 20
= 2 (12 * 5 / 2) + 30 * 20
= 2 (60 / 2) + 600
= 2 * 30 + 600
= 60 + 600
Lp. Prisma = 660 cm²