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b = 4 cm
c = 5 cm
Ka = a + b + c
= 3 cm + 4 cm + 5 cm
= 12 cm
La = 1/2 × a × t
= 1/2 × 3 cm × 4 cm
= 3 cm × 2 cm
= 6 cm²
LP = 2(La) + (Ka × t)
= 2(6) + (12 × 12)
= 12 + 144
= 156 cm²