Bandeira do Brasil

<meta charset="utf-8">

<canvas width="600" height="400"> </canvas>

<script type="text/javascript">

    var tela = document.querySelector('canvas');
    var pincel = tela.getContext('2d');

    //pincel.fillStyle = "lightgrey";
    //pincel.fillRect(0,0,600,400);


    pincel.fillStyle = "green";    
    pincel.fillRect(30,40,700,500);


    pincel.fillStyle = "yellow";
    pincel.beginPath();

    pincel.moveTo(320,375);
    pincel.lineTo(90, 230);
    pincel.lineTo(550,230);
    pincel.fill();

    pincel.fillStyle = "yellow";
    pincel.beginPath();
    pincel.moveTo(320,70);
    pincel.lineTo(550,230);
    pincel.lineTo(90,230);
    pincel.fill();

    pincel.fillStyle = "darkblue";
    pincel.beginPath();
    pincel.arc(320,220,100,0,2*3.14);
    pincel.fill();

</script>