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b=60[cm]=6[dm] wymiary prostokata ABCD
2a+2b obwod ptostokata
2*4+2*6[dm]=8+12[dm]=20[dm]
x dl. boku kwadratu KLMN
4x dl. boku kwadratu
4x=20
x=20:4
x=5[dm]
Dlugosc boku kwadratu wynosi 4[dm]