Circles and triganomatry

Circles and triganomatry

I need to add some divs to a circle, which I have done however they are not consistant. I think my cos and sin equation is wrong, can anyone help??

$('.box').each(function(i) {
       
            var boxw = $(this).width() / 2;
            var boxh = $(this).height() / 2;
       
            ii = i + 1;
       
            var angle = Math.round(pincr * i); // gets the angle for each li 2*Math.PI/360
            $('#results').append('<em>Next Angle: ' + angle + '</em><br />');
           
            // now get the xpos and ypos for the li refererence angle
            var pxpos = Math.round((pradi * Math.cos(angle)) + pradi - boxw);
            var pypos = Math.round((pradi * Math.sin(angle)) + pradi - boxh);
   
            // try and change the li position.....
            $(this).css('left', pxpos);
            $(this).css('top', pypos);
            $(this).css('z-index', ii);
            $(this).append(ii);
           
           
        });