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L.alas = x 18
= 30 x 9
= 270 cm²
keliling alas = 18 + 12 + 18 + 12
= 60 cm
L.permukaan prisma = 2 x L.alas + kliling alas x t.prisma
= 2 x 270 + 60 x 10
= 540 + 600
= 1140 cm²