# What is the distance between  (4, 3, 1)  and (3, 4, 1) ?

$d = \sqrt{{\left({x}_{2} - {x}_{1}\right)}^{2} + {\left({y}_{2} - {y}_{1}\right)}^{2} + {\left({z}_{2} - {z}_{1}\right)}^{2}}$
$= \sqrt{{\left(3 - 4\right)}^{2} + {\left(4 - 3\right)}^{2} + {\left(1 - 1\right)}^{2}} = \sqrt{2}$
The distance formula for calculating the distance between two points in 3D, $\left({x}_{1} , {y}_{1} , {z}_{1}\right)$ and $\left({x}_{2} , {y}_{2} , {z}_{2}\right)$ is as shown above.