A unit circle for proofing the limit of θsinPi/θ

						var board = JXG.JSXGraph.initBoard('box1', {
boundingbox: [-10, 10, 10, -10],showNavigation:false, showcopyright: false, axis: false,
});
var p1 = board.create('point', [-1, -2],{name:'O',size:1,label:{offset:[-20,0]}});
var p2 = board.create('point', [6.5, -2],{face:'',label:{offset:[10,-15]}});

var c1 = board.create('circle', [p1, p2]);

var l1 = board.create('segment', [p1, p2],);
var g1 = board.create('glider', [5, 3, c1],{size:1,label:{offset:[-3,15]}});

var l2 = board.create('line', [p1, g1],{visible:false});
var perp1 = board.create('perpendicularsegment', [l1, p2],{visible:false});
var i1 = board.create('intersection', [perp1, l2],{face:''});
var l3 = board.create('segment', [i1, p2],);

var l4 = board.create('segment', [i1, p1],);
var l5 = board.create('segment', [g1, p2],);
var perp2 = board.create('perpendicularsegment', [l1, g1],{color:'blue'});
var i2 = board.create('intersection', [perp2, l1],{face:'',label:{offset:[-5,-15]}});
var a1 = board.create('angle', [p2, p1, g1],{name:'θ',radius:2});

var pol1 = board.create('polygon', [p1, p2, g1],{fillcolor:'red'});

var pol1 = board.create('polygon', [p1, p2, i1],{fillcolor:'yellow'});
var ms1 = board.create('minorsector', [p1, p2, i1]);