Using Business Intelligence Dashboard Designer : Creating a New Dashboard : Working with Pie Charts
  

Working with Pie Charts

A pie chart gives dashboard consumers an immediate visual clue of the relative sizes of the shares of a whole. Categories are represented by individual slices. The size of the slice in a pie chart is determined by the value.
http://infocenter.pentaho.com/help/topic/puc_user_guide/images/10_pie_chart_preview.png
You can animate a pie chart if you want its pieces to be exploded, which means that the individual slices of the pie can be pulled away from the rest of the pie.
http://infocenter.pentaho.com/help/topic/puc_user_guide/images/19_pie_explosion.png
To animate a pie, enable Animated check box in the Chart Designer window.