Answer
$\dfrac{2}{\sqrt 3}$ or, $\dfrac{2\sqrt 3}{3}$
Work Step by Step
Formula to calculate the shortest distance is:
$D=|\dfrac{pa+qb+rc-s}{\sqrt{p^2+q^2+r^2}}|$
From the given question, we have
$D=|\dfrac{(1)(2)+(1)(0)+(1)(-3)-1}{\sqrt{1^2+1^2+1^2}}|$
$D=\dfrac{2}{\sqrt 3}$ or, $\dfrac{2\sqrt 3}{3}$
