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= 2 (12 * 5 + 12 * 3 + 5 * 3)
= 2 (60 + 36 + 15)
= 2 * 111
= 222 cm²
luas permukaan = 2(12.5 + 12.3+5.3)
luas permukaan = 2(60 + 36 + 15)
luas permukaan = 2 x 111
luas permukaan = 222 cm2