A right trapezoid geometric shape

						var board = JXG.JSXGraph.initBoard('box1', {
boundingbox: [-10, 10, 10, -10],showNavigation:false, showcopyright: false, axis: false,
});



var p1 = board.create('point', [-2, 7],{name:'',face:''});
var p2 = board.create('point', [3.5, 7],{name:'',face:''});
var p3 = board.create('point', [3.5, -4],{name:'',face:''});
var p4 = board.create('point', [-7, -4],{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,p1],);