Simple Shapes

Hi Guys please forgive me for this post but I really am stuck.
The answer must be so simple but…2nd pair of eyes requested.

I am simply trying to create a filled trapezoid.
Here is what I have so far, could anyone show pity and help this learner?

var trapezoid:Shape = new Shape();
trapezoid.graphics.lineStyle(2, 0xFFD700, 1, false, LineScaleMode.VERTICAL,
CapsStyle.NONE, JointStyle.MITER, 10);
trapezoid.graphics.beginfill(0xFFD700);
trapezoid.graphics.moveTo(0,600);

        trapezoid.graphics.lineTo(0, 0);
        trapezoid.graphics.lineTo(300, 150);
        trapezoid.graphics.lineTo(300, 450);
        trapezoid.graphics.lineTo(0, 600); 

trapezoid.graphics.endfill();
this.addChild(trapezoid);

Best
F