This sample compares countries by population density and total area using various radius in a pie series.
In this example, you can see how to render a doughnut chart with different radius. You can use the Radius mapping property to achieve this feature.
DataLabel are used to represent individual data and its values. In addition, the sample shows how to change the order of legends for the doughnut chart by using the Reverse property.
Tooltip is enabled in this example. To see the tooltip in action, hover a point or tap on a point in touch enabled devices.
More information about the pie series can be found in this documentation section.