What is the distance between (9, 2, 0)  and (3, 4, 1) ?

$\sqrt{41}$
Distance between 2 points $\left(x 1 , y 1 , z 1\right) \mathmr{and} \left(x 2 , y 2 , z 2\right)$ = $\sqrt{{\left(x 2 - x 1\right)}^{2} + {\left(y 2 - y 1\right)}^{2} + {\left(z 2 - z 1\right)}^{2}}$
So distance between (9,2,0) and (3,4,1) is $\sqrt{{\left(3 - 9\right)}^{2} + {\left(4 - 2\right)}^{2} + {\left(1 - 0\right)}^{2}}$
=$\sqrt{41}$