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= 16 cm : 2
= 8 cm
b = d₂ : 2
= 12 cm : 2
= 6 cm
a² + b² = c²
8² + 6² = c²
64 + 36 = c²
100 = c²
√100 = √c²
10 = c
s = c
= 10 cm
LP = 2(La) + (Ka × t)
= 2(1/2 × d₁ × d₂) + (4s × t)
= 2(1/2 × 16 × 12) + (4(10) × 12)
= 2(96) + (40 × 12)
= 192 + 480
= 672 cm²
Jadi luas permukaan prisma adalah 672 cm² (tidak ada di pilihan).