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= 8 cm
b = 15 cm - 9 cm
= 6 cm
a² + b² = c²
8² + 6² = c²
64 + 36 = c²
100 = c²
√100 = √c²
10 = c
La = 1/2 × (a + b) × t
= 1/2 × (15 + 9) × 8
= 1/2 × 24 × 8
= 12 × 8
= 96 cm²
Ka = 10 cm + 8 cm + 15 cm + 9 cm
= 42 cm
LP = 2(La) + (Ka × t)
= 2(96) + (42 × 22)
= 192 + 924
= 1.116 cm²
Jadi luas permukaan prisma tersebut adalah 1.116 cm²