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szerokość=a=3
obw=14
2a+2(a+1)=14
4a+2=14
4a=14-2
4a=12
a=3
Pow. pokoju=4*3=12(m²)
----|
___|a
b=a+1
Obw=2a+2b=2a+2(a+1)=2a+2a+2=4a+2
4a+2m=14m
4a=12m
a=3m
b=4m
P=a*b
P=3m*4m=12m²