Respuesta :

[tex]\begin{gathered} BC=\sqrt{(x2-x1)^2+(y2-y1)^2} \\ x2=3 \\ x1=1 \\ y2=1 \\ y1=1 \\ BC=\sqrt{(3-1)^2+(1-1)^2} \\ BC=\sqrt{(2)^2+0} \\ BC=\sqrt{4} \\ BC=2 \\ The\text{ length of the side BC is 2} \end{gathered}[/tex]

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