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Obw.=2m=200cm
obw=10x
10x=200cm :10
x=20cm
Krotszy bok ma dlugosc 2x=2*20cm=40cm=0.4m
dluzszy bok ma dlugosc 3x=3*20cm=60cm=0.6m
P=a*b
P=0.4m*0.6m
P=0.24m²=2400cm²