[tex]a)\\\\bok\ kwadratu:\\\\b =2\ cm\\\\wzor\ na\ przekatna\ kwadratu:\\\\a=b\sqrt{2}\\\\a=2\sqrt{2}\ cm[/tex]
[tex]b)\\\\ przekatna\ kwadratu:\ d=7\sqrt{2}\ cm\\\\d=b\sqrt{2}\\\\ b\sqrt{2}=7\sqrt{2}\ ]\ |:\sqrt{2}\\\\b=7\ cm[/tex]
[tex]c)\\\\ przekatna\ kwadratu:\ d=5\ cm\\\\d=c\sqrt{2}\\\\ c\sqrt{2}=5\ \ |:\sqrt{2}\\\\c= \frac{5}{\sqrt{2}}*\frac{\sqrt{2}}{\sqrt{2}}=\frac{5\sqrt{2}}{2}=2,5\sqrt{2}\ cm[/tex]
