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x+2 - krawędź boczna
razem - 336cm
12*x+6*x+2=336cm
12x=336cm/6-2
12x=56cm-2cm
12x=54cm
x=54m/12
x=4,5cm - krawędź podstawy
Obw.=4,5cm*6=27cm- obwód podstawy