[tex]\bf ~~~~~~~~~~~~\textit{distance between 2 points}
\\\\
C(\stackrel{x_1}{6}~,~\stackrel{y_1}{-5})\qquad
D(\stackrel{x_2}{-1}~,~\stackrel{y_2}{-4})\qquad \qquad
d = \sqrt{( x_2- x_1)^2 + ( y_2- y_1)^2}
\\\\\\
CD=\sqrt{[-1-6]^2+[-4-(-5)]^2}\implies CD=\sqrt{(-1-6)^2+(-4+5)^2}
\\\\\\
CD=\sqrt{(-7)^2+1^2}\implies CD=\sqrt{49+1}
\\\\\\
CD=\sqrt{50}\implies CD\approx 7.0710678\implies CD=\stackrel{\textit{rounded up}}{7.1}[/tex]
