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a = 4x3,5= 14 cm
P=a x b = 280 cm2
stąd b P/a = 20 cm
Obwód 2x14 + 2x20 = 68cm
Jeden z boków ma 14cm.
280= 14x b/: 14
b= 20cm
2x 20+ 2x 14= 68cm
Obwód prostokąta ma 68 sm.