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p= a2
6.25=a2
a= 2.5dm
ob= 4a
ob=4*2.5
ob=10dm
6,25=a²
a=2,5 ,( bo 2,5 ²=6,25)
Ob=4* a
Ob=4* 2,5
Ob=10
Odp.Obwód tego kwadratu wynosi 10cm