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4*384cm²
1536cm²
tinggi = 9,6 cm
dit : luas bidang tegak????
prisma bentuk ap dulu klo persegi luas b. tegak =4 × 1/2 × a × t
= 4 × 1/2 × 40 × 9,6cm
= 4 × 20 × 9,6
= 768 cm²