`
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var pantalla = document.querySelector ("canvas");
var pincel = pantalla.getContext("2d");
pincel.fillStyle = "lightgrey";
pincel.fillRect (0,0,600,400);
pincel.fillStyle = "green";
pincel.fillRect (0,0,200,400);
pincel.fillStyle = "red";
pincel.fillRect (400,0,200,400);
pincel.fillStyle = "yellow";
pincel.beginPath ();
pincel.moveTo(300,200);
pincel.lineTo(200,400);
pincel.lineTo(400,400);
pincel.fill();
pincel.fillStyle = "blue";
pincel.beginPath ();
pincel.arc(300,200,50,0,2*3.14);
pincel.fill();
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