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p = y + 9
K = 2(p + l)
134 = 2((y + 9) + y)
67 = (y + 9) + y
67 = y + 9 + y
67 - 9 = y + y
58 = 2y
29 = y
l = y
= 29 cm
p = y + 9
= 29 + 9
= 38 cm
LP = 2(La) + (Ka × t)
= 2(p × l) + (2(p + l) × t)
= 2(38 × 29) + (2(38 + 29) × 79)
= 2(1.102) + (134 × 79)
= 2.204 + 10.586
= 12.790 cm²
Jadi luas permukaan prisma tersebut adalah 12.790 cm².
Semoga membantu :)