Question 917605
{{{blue(x^2+y^2<=9)}}}<--->{{{blue(x^2+y^2<=3^2)}}} means all the points at a distance of 3 or less from the origin.
That means all the points inside the circle centered at the origin, with radius 3 (including the circumference).
{{{x-y>0}}} includes all the points to one side of the line
{{{green(x-y=0)}}}<--->{{{green(y=x)}}} , but not the points on the line {{{y=x}}} .
So, you could say that the vertices are the points {{{P(3sqrt(2),3sqrt(2))}}} and {{{Q(-3sqrt(2),-3sqrt(2))}}} ,
but those points are not part of the solution.
The solution is the area inside the lines in the graph below,
plus the blue boundary lines (but not the green line).
{{{drawing(300,300,-5,5,-5,5,
grid(1),
blue(arc(0,0,6,6,-45,135)),
blue(arc(0,0,6.05,6.05,-45,135)),
blue(arc(0,0,5.95,5.95,-45,135)),
green(line(-1.5sqrt(2),-1.5sqrt(2),-1.4,-1.4)),
green(line(-0.7,-0.7,0.7,0.7)),
green(line(1.4,1.4,1.5sqrt(2),1.5sqrt(2)))
)}}}