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b = 4
c = 5
t = 20
alas = 1/2 × a × t
= 1/2 × 3 × 4
alas = 6
Luas permukaan prisma = 2 × luas alas + (keliling alas × tinggi)
= 2 × 6 + (3+4+5) × 20
= 2 × 6 + 17 × 20
= 12 + 340
= 352 cm²
jadi luas permukaan prisma tersebut adalah 352cm²
semoga bermanfaat, tolong jadikan jawaban terbaik ya ;)