Question 858665
{{{x=r*cos(theta)}}}
{{{y=r*sin(theta)}}}
{{{2x^2+2y^2=5}}}
{{{x^2+y^2=5/2}}}
{{{(r*cos(theta))^2+(r*sin(theta))^2=5/2}}}
{{{r^2(cos(theta)^2+sin(theta)^2)=5/2}}}
{{{r^2(1)=5/2}}}
{{{r^2=5/2}}}