Reference: drawCircle
drawCircle(v, r) draws a circle with center v ∈ R^2 and radius r in the current 2D visualization window. drawCircle(v, r, s) draws a circle with center v ∈ R^2 and radius r in the current 2D visualization window using the style (CSS) s. All numbers refer to the visualization window's coordinate system. Example: drawCircle(❨2, 2❩, 1, "colour:red; border−colour:white")