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b=x
obwód prostokąta=2a+2b=2(x+y)+2x=2x+2y+2x=4x+2y
obwód kwadratu=4a
4a=4x+2y/:2
2a=2x+y
a=(2x+y)/2
a=x+½y= bok kwadratu
szerokosc- x
obwod- x+y+x+X+Y+x= 4x+2y
ilosc bokow w kwadracie- 4
4x+2y: 4 = x+ 1/2y
odp. Jeden bok kwadratu ma dlugosc x i 1/2y.