The documentation of the x and y parameters of the strokeArc and fillArc methods in the GraphicsContext seems unclear.

x - the X coordinate of the arc.
y - the Y coordinate of the arc.

For example the strokeRect documentation clearly states what x and y means
x - the X position of the upper left corner of the rectangle.
y - the Y position of the upper left corner of the rectangle.

I think, it would be nice if the strokeArc and fillArc methods documentation would clearly state where the x,y coordinates are located.