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Sagot :

LEAFE

Bonjour,

[tex]||$\overrightarrow{AB}|| = \sqrt{(x_b - x_a)^2 + (y_b -y_a)^2}[/tex]

         [tex]= \sqrt{(1 - 1)^2 + (-\frac{2}{3} - \frac{1}{3} )^2}[/tex]

         [tex]= \sqrt{0^2 + (-\frac{3}{3})^2}[/tex]

         [tex]= \sqrt{(-1)^2} = \sqrt{1} = 1[/tex]

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