[tex]Zadanie\\\\d=\frac{\sqrt{2} }{2}\ cm\\\\d=a\sqrt{2}\\\\a\sqrt{2}=\frac{\sqrt{2} }{2}\ \ \mid: \sqrt{2}\\\\a=\frac{1}{2}\ cm=0,5\ cm \\\\Ob.=4\cdot a\\\\Ob.=4\cdot\frac{1}{2}= 2\ cm\\\\Odp.\ "2"[/tex]
