Odpowiedź:
1)
[tex]a^2+(4cm)^2=(5cm)^2[/tex]
2)
[tex]8=a\sqrt{2}\\a=\frac{8}{\sqrt{2}}=\frac{8}{\sqrt{2}}*\frac{\sqrt{2}}{\sqrt{2}}=\frac{8\sqrt{2}}{2}=4\sqrt{2}[/tex]
