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Luas alas= 1/2 (12+18) x 10
=150 cm²
Keliling= 12+10+18+17 = 57 cm
Tinggi prismanya = 10 cm
Luas permukaan prisma = (2 x Luas alas) + (K x tinggi)
= (2x 150) + (57 x 10)
=300+ 570
=870 cm²