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=42×50
=2100cm²
L2=24×(42-18)
=24×24
=576cm²
Ltotal=2.100+576
=2.676cm²
2. L1=58×52
=3.016cm²
L2=58×(86-52)/2
=58×17
=986cm²
Ltotal=3.016+986
=4.002cm²