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FB = √(12² + 5²)
FB = √(144+25)
FB = √169
FB = 13 cm
L permukaan prisma
= (2 × L alas) + (K alas × t)
= [2 × 1/2 × (5 + 10) × 12] + (5+10+12+13) × 25
= 180 + 1000
= 1.180 cm²
semoga membantu ^^
Jawabannya (B)