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a = 8 cm
b = 18 cm - 12 cm
= 6 cm
a² + b² = c²
8² + 6² = c²
64 + 36 = c²
100 = c²
√100 = √c²
10 = c
Sisi miring = c
= 10 cm
La = 1/2 × (a + b) × t
= 1/2 × (12 + 18) × 8
= 1/2 × 30 × 8
= 120 cm²
Ka = t + a + sisi miring + b
= 8 cm + 12 cm + 10 cm + 18 cm
= 48 cm
LP = 2(La) + (Ka × t)
= 2(120) + (48 × 8)
= 240 + 384
= 624 cm²
Jadi luas permukaan prisma tersebut adalah 624 cm²