Question 924257
{{{2(pi)(r) - pi + ((pi^2)(r)/2) = 0}}}
{{{2(pi)(r) +((pi^2)(r)/2) = pi}}}
{{{r(2*pi+pi^2/2)=pi}}}
{{{r=pi/(2*pi+pi^2/2)}}}
{{{r=1/(2+pi/2)}}}
{{{highlight(r=2/(4+pi))}}}