[tex]\bf \textit{distance between 2 points}\\ \quad \\
\begin{array}{lllll}
&x_1&y_1&x_2&y_2\\
% (a,b)
&({{ \frac{9}{5}}}\quad ,&{{ -\frac{5}{3}}})\quad
% (c,d)
&({{ \frac{6}{5}}}\quad ,&{{ -\frac{7}{3}}})
\end{array}\qquad
% distance value
d = \sqrt{({{ x_2}}-{{ x_1}})^2 + ({{ y_2}}-{{ y_1}})^2}[/tex]
