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= 2*((10*8)+(10*5)+(8*5))
= 2*(80+50+40)
= 2*170 = 340 cm²
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Lp = 2 ( 10 cm × 8 cm + 10 cm × 5 cm + 8 cm × 5 cm )
Lp = 2 ( 80 cm^2 + 50 cm^2 + 40 cm^2 )
Lp = 2 × 170 cm^2
Lp = 340 cm^2