google.charts.load('current', {packages: });

<script type="text/javascript" src="https://www.gstatic.com/charts/loader.js"></script>
<script type="text/javascript">
 
  // Load the Visualization API and the piechart package.
  google.charts.load('current', {
    packages: ['corechart']
  });
  google.charts.setOnLoadCallback(drawChart);
 
  // Callback that creates and populates a data table,
  // instantiates the pie chart, passes in the data and draws it.
  function drawChart() {
 
    // Create the data table.
    var data = new google.visualization.DataTable();
    data.addColumn('string', 'Topping');
    data.addColumn('number', 'Slices');
    data.addRows([
      ['a', 1],
      ['b', 2],
      ['c', 3],
      ['d', 4],
      ['e', 5]
    ]);
 
    // Set chart options
    var thiswidth = $('#chart_div').width();
    var thisheight =thiswidth * 7/8;
    var options = {
      'title':'How Much Pizza Everyone Ate Last Night',
      'width':thiswidth,
      'height':thisheight
    };
 
    // Instantiate and draw our chart, passing in some options.
    var chart = new google.visualization.PieChart(document.getElementById('chart_div'));
    chart.draw(data, options);
  }
</script>
<div id="chart_div" style="width:100%; height:auto"></div>