var a = 0; var y1 = 0; var x1 = 0; for (var i=0; i != 360 ; i+=10){ a = (i)* ((2*Math.PI)/360); y1 = 100 * Math.sin(a); x1 = 100 * Math.cos(a); this.moveTo(110,110); this.lineTo(110+x1, 110+y1); this.lineTo(110,110+y1); } this.strokeStyle = 0; this.lineWidth = 1; this.stroke();