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How to create a google pie chart in HTML

<!DOCTYPE html>
<html lang="en-US">
<div id="piechart"></div>
<script type="text/javascript" src=""></script>
<script type="text/javascript">
// Load google charts
google.charts.load('current', {'packages':['corechart']});
// Draw the chart and set the chart values
function drawChart() {
var data = google.visualization.arrayToDataTable([
['Task', 'Page visit per Day'],
['PHP', 8],
['JAVA', 8],
['SQL', 4],
['Wordpress', 2],
['JSP', 2]
// Optional; add a title and set the width and height of the chart
var options = {'title':'My Average page visit per Day', 'width':550, 'height':400};
// Display the chart inside the <div> element with id="piechart"
var chart = new google.visualization.PieChart(document.getElementById('piechart'));
chart.draw(data, options);