A concave poolygon

						var board = JXG.JSXGraph.initBoard('box1', {
boundingbox: [-10, 10, 10, -10],shownavigation:false, showcopyright: false, axis: false,
});
var p1 = board.create('point', [-4, -3],{name:'',face:''});
var p2 = board.create('point', [4, -3],{name:'',face:''});
var p3 = board.create('point', [8, 6],{name:'',face:''});
var p4 = board.create('point', [0, 1.0],{name:'',face:''});
var p5 = board.create('point', [-8, 6],{name:'',face:''});
var l1 = board.create('segment', [p1, p2]);
var l2 = board.create('segment', [p2,p3],);
var l3 = board.create('segment', [p3,p4],);
var l4 = board.create('segment', [p4,p5],);
var l5 = board.create('segment', [p5,p1],);