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L 1 =18×8=144/2=72CM²
L2=6×10=60/2=30CM² Ls=222cm²
L3=12×10 =120CM²
No2
L1=18×18=324cm²
L2 =20×18:2=360:2=180cm² Ls= 504cm²
No 3
L1=2×14×6:2=28×6:2=168:2=84cm²
L2 = 14×14=196cm² Ls=280cm²