# What is the distance between (2,7,4) and (7,4,1)?

Distance is $6.56 \left(2 \mathrm{dp}\right) u n i t s$
Distance $D = \sqrt{{\left({x}_{2} - {x}_{1}\right)}^{2} + {\left({y}_{2} - {y}_{1}\right)}^{2} + {\left({z}_{2} - {z}_{1}\right)}^{2}} = \sqrt{{\left(7 - 2\right)}^{2} + {\left(4 - 7\right)}^{2} + {\left(1 - 4\right)}^{2}} = \sqrt{25 + 9 + 9} = \sqrt{43} = 6.56 \left(2 \mathrm{dp}\right) u n i t s$[Ans]