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b=6cm
P=2cm*6cm=12cm
prostokąt: boki
6 cm, 6 cm, 2 cm, 2 cm
x-4 - drugi bok
2x+2(x-4)=16
4x-8=16
4x=16+8
x=24/4
x=6
6-4=2
P=6*2=12