# What is the distance between (-1,4,19) and (3,-5,-2)?

$\sqrt{{4}^{2} + {9}^{2} + {21}^{2}} = \sqrt{538}$
dist $\left(x , y\right) = \sqrt{{\left(\Delta x\right)}^{2} + {\left(\Delta y\right)}^{2} + {\left(\Delta z\right)}^{2}}$
where $\Delta a =$dist $\left({a}_{1} , {a}_{2}\right) = {a}_{2} - {a}_{1}$