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b = 15 cm
c = 17 cm
Ka = a + b + c
= 8 cm + 15 cm + 17 cm
= 40 cm
La = 1/2 × a × t
= 1/2 × 8 cm × 15 cm
= 4 cm × 15 cm
= 60 cm²
LP = 2(La) + (Ka × t)
= 2(60) + (40 × 30)
= 120 + 1.200
= 1.320 cm²
Jadi luas permukaan prisma tersebut adalah 1.320 cm²