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Lp=2 x 1/2 x 12 x 16 + (12+16+20) x 25
Lp=2 x 96 +48 x 25
Lp=192'+1200
Lp=1392 cm²
= (2 x 2x16/2) + (48 x 25)
= 192 + 1200
= 1392 cm²