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a=12cm
b=18cm
ob.=2×12+2×18=24+36=60cm
60:1,5=40cm= obwód kwadratu
obwód kwadratu=4a
40=4a
a=40:4
a=10cm
odp. bok kwadratu ma 10cm
60: 1,5= 40
40= 4a |: 4
a=10
odp: Bok tego kwadratu ma 10 cm:)