Question 30182
{{{ 4 }}} and {{{ (sqrt(5)) - (sqrt(5)) }}} and {{{ (sqrt(5))+(sqrt(3)) }}}
The part tat bothers me here is {{{ (sqrt(5)) - (sqrt(5)) }}} 
x-x = 0
3-3=0
root5-root5=0
you cant have a side's lenght = 0