Distance between (1,6) and (2,5)?

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