Question 1083697
{{{ sqrt( ( 1 - 5 )^2 + ( -3 -(-7))^2 ) }}}
{{{ sqrt( ( -4 )^2 + ( 4 )^2 ) }}}
{{{ sqrt( 16 + 16 ) }}}
{{{ sqrt( 32 ) }}}
{{{ 4*sqrt(2) }}}
This is the length of the line segment.
Is that what you want?