<canvas width="600" height="400"></canvas>
<script>
let canvas = document.querySelector ("canvas");
let pincel = canvas.getContext ("2d");
//Retangulo Bandeira do Brasil:
pincel.fillStyle = "green";
pincel.fillRect (0, 0, 600, 400);
// Losango da Bandeira do Brasil:
pincel.fillStyle = "yellow";
pincel.beginPath ();
pincel.moveTo (300, 50);
pincel.lineTo (50, 200);
pincel.lineTo (300, 350);
pincel.lineTo (550, 200);
pincel.fill ();
// Circulo da Bandeira do Brasil:
pincel.fillStyle = "darkBlue";
pincel.beginPath ();
pincel.arc (300, 200, 100, 0, 2*3.14);
pincel.fill ();
</script>
