A Rose chart customised to be a Pie chart

With a Pie chart the segments all have the same radius. The Rose chart can be customised to show a Pie chart with variable radius segments

[No canvas support]

This goes in the documents header: 
<script src="RGraph.common.core.js"></script>
<script src="RGraph.common.dynamic.js"></script>
<script src="RGraph.common.tooltips.js"></script>
<script src="RGraph.rose.js"></script>
Put this where you want the chart to show up: 
<div style="padding: 50px">
    <canvas id="cvs" width="450" height="450" style="border: 1px solid #ddd">[No canvas support]</canvas>
</div>
This is the code that generates the chart: