I don't think the configuration options accept percentages for width 
(although they do for chartArea.width, so maybe they will).  You can 
calculate them yourself, though:

// set width to 65% of the div's width
var pieDiv = document.getElementById('chart_div2');
options = {width: pieDiv.style.width * 0.65};

var chart = new google.visualization.PieChart(pieDiv);
chart.draw(data, options);

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