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PP = 10 × 5 = 50cm²
PB₁ = 10 × 3 = 30cm²
PB₂ = 5 × 3 = 15cm²
PPC = 2 × 50 + 2 × 30 + 2 × 15
PPC = 100 + 60 + 30
PPC = 190cm²