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12+9+12+15
48
luas alas = 4.3/2 = 6 cm²
keliling alas = 3+4+5 = 12 cm
tinggi prisma = 6 cm
jawab :
Luas perm = (2 x L alas) + (K alas x tinggi prisma)
= (2 x 6) + (12 x 6)
= 12 + 72
= 84 cm²