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L1:PxL
16x10
:160
L2:1/2xaxt
1/2x16-12x8
2x6:12
160+12
:172cm

L1 = p.l
= 16.10
= 160 cm²
L2 = 1/2.a.t
= 1/2.4.6
= 2.6
= 12 cm²
L1 + L2 =
160 + 12 = 172 cm²