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b=2 cm - Krótszy Bok
P= 6*2 = 12cm²
6+6+2+2=12+4=16cm
Pole prostokąta=a*b=6*2=12cm
x-4 - krótszy
2x+2(x-4)=16
2x+2x-8=16/+8
4x==24/:4
x=6
6-4=2