[tex]\boxed{d=\sqrt{(x_a-x_b)^2+(y_a-y_b)^2}}\\ \\ d=\sqrt{(2-(-4))^2+(5-(-1))^2}\\ \\ d = \sqrt{(2+4)^2+(5+1)^2}\\ \\ d=\sqrt{6^2+6^2}\\ \\ d=\sqrt{36+36}\\ \\ d=\sqrt{72}\\ \\ d=\sqrt{2}\cdot\sqrt{36}\\ \\ \boxed{d=6\sqrt{2}}[/tex]
[tex]\sqrt{2} = 1,41\\ \\ \boxed{d\approx8,5} [/tex]
