How can I draw the ellipse without a portion of it, defined by two angles?

Hi ! How can I draw an ellipse without a portion of it (without a slice)??
I have a start angle and end angle of the ellipse refered to the centre, 
but if I try with:

/	cairo_save(cr)/
	//cairo_///translate(cr,x + width / 2., y + height / 2.);
//        /////  cairo_/////scale(cr,1. * (width / 2.), 1. * (height / 2.));
//	/////cairo_/////arc(cr,0., 0., 1., S_ANGLE, E_ANGLE);
	cairo_restore(cr);
	cairo_stroke(cr);

/the ellipse drawn isn't correct, because in scaling the coords. I scale the angles.
How can I draw the ellipse without a correct portion of it, defined by two angles?

Thank you,
Carlo
/  /

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