<canvas width='1000' height='800'></canvas>
<script>
var tela = document.querySelector('canvas');
var pincel = tela.getContext('2d');
pincel.fillStyle="green";
pincel.beginPath();
pincel.fillRect(0,0,600,420);
pincel.fillStyle='yellow';
pincel.beginPath();
pincel.moveTo(51,210);
pincel.lineTo(300,51);
pincel.lineTo(549,210);
pincel.lineTo(300,369);
pincel.lineTo(51,210);
pincel.fill();
pincel.fillStyle="darkblue";
pincel.beginPath();
pincel.arc(300,210,105,0,2*3.14);
pincel.fill();
