Odpowiedź:
[tex]d = a\sqrt{2}[/tex]
[tex]2\sqrt{5} =a\sqrt{2}[/tex]
[tex]\frac{a\sqrt{2} }{\sqrt{2} } =\frac{2\sqrt{5} }{\sqrt{2} }[/tex]
[tex]a=\frac{2\sqrt{5} }{\sqrt{2} }[/tex]
[tex]a=\frac{2\sqrt{5} }{\sqrt{2} } *\frac{\sqrt{2} }{\sqrt{2} }[/tex]
[tex]a=\frac{2\sqrt{5}\sqrt{2} }{2}[/tex]
[tex]a=\sqrt{5*2{}[/tex]
[tex]a=\sqrt{10}[/tex]
obw: [tex]\sqrt{10}*2+2\sqrt{5}[/tex] = [tex]2\sqrt{10}+2\sqrt{5}[/tex]
pole: [tex]\frac{\sqrt{10}*\sqrt{10} }{2}=5[/tex]
