[tex]\displaystyle\bf\\Un~cub~are~6~fete,~fiecare~fata~fiind~un~patrat~cu~latura~de~1,2~m.\\\\Aria~unei~fete~=~L^2=1,2^2=1,44~m^2\\\\Suma~ariilor~tuturor~fetelor~unui~cub~cu~muchia~de~1,2~m~este:\\\\A~totala=6\times(1,2)^2=6\times1,44=\boxed{\bf8,64~m^2}[/tex]
