A trangle with a line parallel to one side and intersecting with two others

						var board = JXG.JSXGraph.initBoard('box1', {
boundingbox: [-6, 6, 6, -6],showNavigation:false, showcopyright: false, axis: false,
});
var p1 = board.create('point', [-2, 4.0],{face:'',fixed:true});
var p2 = board.create('point', [-5, -1],{name:"E",face:'',fixed:true});
var p3 = board.create('point', [4, -1],{name:"C",face:'',fixed:true});
var l1 = board.create('segment', [p1, p2],{withLabel:true, name:'5',label:{offset:[-10,5]}});
var l2 = board.create('segment', [p1,p3],);
var l3 = board.create('segment', [p2,p3],{withLabel:true, name:'4'});
var p4 = board.create('point', [-2, -1],{name:"D",face:'',fixed:true});
var pl1 = board.create('parallel', [l1, p4],{visible:false});
var i1 = board.create('intersection', [pl1, l2],{face:'',fixed:true});
var l4 = board.create('segment', [i1,p4],{withLabel:true, name:'3',label:{offset:[-10,5]}});