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luas seluruh sisi prisma = 2 x luas alas + 3 luas sisi tegak
= 2 x 1/2 x 20 x 16 + 16 x 15 + 20 x 15 + 12 x 15
= 320 + 240 + 300 + 180
= 1040 cm²
semoga membantu ^_^