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= 2 × (1/2 × d1 × d2) + (2 × 8 + 2 × 13) × t
= 2 × (1/2 × 8 × 13) + (16 + 26) × 15
= 2 × (4 × 13) + 42 × 15
= 2 × 52 + 42 × 15
= 104 + 42 × 15
= 104 + 630
= 734 cm²