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a= bok
obwód=4a
prostokąt
a=bok
b=a+4
obwód=2a+2b=2a+2(a+4)=2a+2a+8=4a+8
4a+8=3×4a
8=12a-4a
a=1
b=1+4=5
bok kwadratu=1