Processing          Paint

So basically when I draw a circle in the Processing IDE it comes out really bad, practically a square, especially compared to drawing a simple circle myself in paint with the same dimensions. Is there some way to draw the circle that paint can draw with the circle tool instead of the squarish one I get? It gets better if the circle is bigger, but if I go smaller than this (which is what I need) the bottom and right edges of the circle are completely flat lines like a square.

1. void setup()
   {
     size(1280,720);
     background(100,0,0);
   }
   void draw()
   {
     stroke(255,0,0);
     fill(255,0,0);
     ellipse(width/2,height/2,width/89,height/50);
   }