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= 2 (a * t / 2) + ((p * l) + (p * l) + (p * l))
= 2 (4 * 3 / 2) + ((12 * 3) + (12 * 4) + (12 * 5))
= 2 * 6 + (36 + 48 + 60)
= 12 + 144
= 156 cm²