<canvas width=1650 height= 900></canvas>
<script>
var tela = document.querySelector('canvas');
var pincel = tela.getContext('2d');
pincel.fillStyle ='purple';
pincel.fillRect(0, 0, 1650, 900);
pincel.fillStyle = 'red';
pincel.fillRect(550, 0, 525, 900 )
pincel.fillStyle = 'black';
pincel.beginPath();
pincel.moveTo(850, 450);
pincel.lineTo(750, 900);
pincel.lineTo(925, 900);
pincel.fill();
pincel.fillStyle = 'blue';
pincel.beginPath();
pincel.arc(850, 450, 250, 0, 2 * 3.14);
pincell.fill();
</script>