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sisi belah ketupat = 12²+9² = 144+81 = √225 = 15
keliling alas(belah ketupat ) = 4×s
= 4×15
=60
Luas permukaan prisma = 2 × luas alas + keliling alas × tinggi prisma
= 2×216 +60× 20
=1632 cm²