[tex]\displaystyle K(6;-4;8); N(-6;5;-12)\\|KN|=\sqrt{(-6-6)^2+(5-(-4))^2+(-12-8)^2}=\sqrt{(-12)^2+(9)^2+(-20)^2}=\\\\=\sqrt{144+81+400}=\sqrt{625}= 25[/tex]
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[tex]\displaystyle K(6;-4;8); N(-6;5;-12)\\|KN|=\sqrt{(-6-6)^2+(5-(-4))^2+(-12-8)^2}=\sqrt{(-12)^2+(9)^2+(-20)^2}=\\\\=\sqrt{144+81+400}=\sqrt{625}= 25[/tex]