# What is the distance between (1, 6)  and (2,5) ?

May 6, 2016

$\sqrt{2}$

#### Explanation:

Distance between (x1, y1) and (x2, y2) is given by:
$D = \sqrt{{\left(x 2 - x 1\right)}^{2} + {\left(y 2 - y 1\right)}^{2}}$
Then,
D = sqrt((2-1)^2+(5-6)^2
$= \sqrt{{1}^{2} + {\left(- 1\right)}^{2}}$
$= \sqrt{2}$