<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title></title>
</head>
<body>
<canvas width="600" height="400">
</canvas>
<script>
var pantalla = document.querySelector("canvas");
var pincel = pantalla.getContext("2d");
//bandera
pincel.fillStyle = "lightgrey"; //caracteristica
pincel.fillRect(0,0,600,400); //funcion
pincel.fillStyle = "green";
pincel.fillRect(0,0,200,400);
pincel.fillStyle = "red";
pincel.fillRect(400,0,200,400);
//triangulo
pincel.fillStyle = "yellow";
pincel.beginPath();
pincel.moveTo(300,200);
pincel.lineTo(200,400);
pincel.lineTo(400,400);
pincel.fill();
//circunferencia
pincel.fillStyle = "blue";
pincel.beginPath();
pincel.arc(300,200,50,0,2*3.14);
pincel.fill();
</script>
</body>
</html>
