Question

Find the distance of the point $(-1,5,-5)$ from the origin.

Answer 1

The distance between the points $(-1,5,-5)$ and $(0,0,0)$ is $\sqrt{(-1-0{)}^2+(5-0{)}^2+(-5-0{)}^2}$

$=\sqrt{1+25+25}=\sqrt{51}$ units.