A trangle geometric shape

						var board = JXG.JSXGraph.initBoard('box1', {
boundingbox: [-10, 10, 10, -10],showNavigation:false, showcopyright: false, axis: false,
});
var p1 = board.create('point', [-8, -5],{face:'',label:{offset:[-15,0]}});
var p2 = board.create('point', [-8, -1],{face:'',label:{offset:[-15,-5]}});
var p3 = board.create('point', [-5, -5],{name:'D',face:'',label:{offset:[12,0]}});
var l1 = board.create('segment', [p1, p2],{withlabel:true, name:'4',label:{offset:[-15,0]}});
var l2 = board.create('segment', [p2, p3]);
var l3 = board.create('segment', [p1, p3],{withlabel:true, name:'3',label:{offset:[0,-10]}});
var perp1 = board.create('perpendicular', [l2, p3],{visible:false});
 
var p4 = board.create('point', [4.6, 2.2],{name:'C',face:''});
var l4 = board.create('segment', [p4, p3],{withlabel:true, name:'12',label:{offset:[-5,-15]}});
var l5 = board.create('segment', [p4, p2],{withlabel:true, name:'13',label:{offset:[-5, 10]}});