Question 1174783
If each side of the square has length {{{s}}} then the diagonal {{{ d}}} is related to {{{s}}} by:

{{{ s^2 + s^2 = d^2 }}}<br>
{{{ 2s^2 = d^2 }}}<br>
{{{ s^2 = d^2/2 }}}<br>
{{{ s = d/sqrt(2) }}}