[tex]Obw. = 12,4 \ cm\\Obw. = 4a[/tex]
[tex]a = 12,4 : 4 = \boxed{3,1}[/tex]
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[tex]Obw. = 12,4 \ cm\\Obw. = 4a[/tex]
[tex]a = 12,4 : 4 = \boxed{3,1}[/tex]