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

P.S: Sorry for the double post.

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