Bandeira do Brasil

Bom dia, assim ficou minha bandeira.

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


<script>

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

    pincel.fillStyle = 'green';        
    pincel.fillRect(0,0,600,400);        

    pincel.fillStyle = 'yellow';
    pincel.beginPath();            
    pincel.moveTo(300,25);        
    pincel.lineTo(50,200);        
    pincel.lineTo(300,375);
    pincel.lineTo(550,200);
    pincel.lineTo(300,25);
    pincel.fill();        

    pincel.fillStyle = 'blue';
    pincel.beginPath();
    pincel.arc(300, 200, 125, 0, 2*3.14);            
    pincel.fill();

    pincel.fillStyle = 'white';            
    pincel.fillRect(175,190,250,20);


</script>