Răspuns:
[tex]\boldsymbol{ \red{A)\ 5 \ m}}[/tex]
Explicație pas cu pas:
[tex]\boxed{\boldsymbol{ EF = \sqrt{(x_{F} - x_{E})^{2} + (y_{F} - y_{E})^{2} } }}[/tex]
[tex]EF = \sqrt{(3\sqrt{7} - 2\sqrt{7} )^{2} + (\sqrt{2} - 4\sqrt{2} )^{2} }[/tex]
[tex]EF = \sqrt{(\sqrt{7} )^{2} + (-3\sqrt{2} )^{2} } = \sqrt{7+18} = \sqrt{25}\\[/tex]
[tex]EF = 5 \ m[/tex]