# Let (2, 1) and (10, 4) be the coordinates of points A and B on the coordinate plane. What is the distance in units from points A to point B?

$\text{distance} = \sqrt{73} \approx 8.544$ units
Given: $A \left(2 , 1\right) , B \left(10 , 4\right)$. Find the distance from A to B.
Use the distance formula: $d = \sqrt{{\left({y}_{2} - {y}_{1}\right)}^{2} + {\left({x}_{2} - {x}_{1}\right)}^{2}}$
$d = \sqrt{{\left(4 - 1\right)}^{2} + {\left(10 - 2\right)}^{2}} = \sqrt{{3}^{2} + {8}^{2}} = \sqrt{73}$