On some IT graphic systems, you have tools which draw line segments and circle or elipse arcs, but which do not draw parabolas or hyperbolas, and in many cases, those system keep track of graphical objets to redraw them for you, so, it wouldn't be efficient to draw the piwel by pixel.
So my question is, how could I find a good way to segment a simple hyperbola (like $y^2-x^2=1$) arc, with arcs of "horizontal" or "vertical" ellipses (like $a(x-x_0)^2+b(y-y_0)^2=1$), to make a good approximation with ellipses and lines ?
I calculated the radius of the tangent circle as a function for both hyperbola et ellipses, but then I feel blocked.