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Verified answer
Luas permukaan prisma =luas alas + tutup = 2x1/2x12x9 = 108 cm2
luas 3 bidang tegak = (12x30)+(9x30)+(15x30) = 360 + 270 + 450 = 1080 cm2
maka luas permukaan prisma = 1080+108 = 1188 cm2
good luck...