[tex]\bf \textit{distance between 2 points}\\ \quad \\
\begin{array}{lllll}
&x_1&y_1&x_2&y_2\\
% (a,b)
W&({{ -6}}\quad ,&{{ -8}})\quad
% (c,d)
X&({{ 6}}\quad ,&{{ 8}})
\end{array}\quad
% distance value
d = \sqrt{({{ x_2}}-{{ x_1}})^2 + ({{ y_2}}-{{ y_1}})^2}
\\\\\\
d=\sqrt{[6-(-6)]^2+[8-(-8)]^2}\implies d=\sqrt{(6+6)^2+(8+8)^2}[/tex]
