Luas permukaan
= 2 × (pl + pt + lt)
= 2 × (20(12) + 20(8) + 12(8))
= 2 × (240 + 160 + 96)
= 2 × 496
= 992cm²
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Luas permukaan
= 2 × (pl + pt + lt)
= 2 × (20(12) + 20(8) + 12(8))
= 2 × (240 + 160 + 96)
= 2 × 496
= 992cm²