<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>ESCUADRA</title>
</head>
<body>
<canvas width="600" height="400"></canvas>
<script>
var lienzo = document.querySelector('canvas');
var pincel = lienzo.getContext('2d');
pincel.fillStyle = 'black';
pincel.beginPath();
pincel.moveTo(50,50);
pincel.lineTo(400,400);
pincel.lineTo(50,400);
pincel.fill();
pincel.fillStyle = 'white';
pincel.beginPath();
pincel.moveTo(100,175);
pincel.lineTo(275,350);
pincel.lineTo(100,350);
pincel.fill();
</script>
</body>
</html>
