Category charts can plot Pie charts. Pie charts represent each
series defined as a slice or wedge of the pie. Associated with each
wedge is a value and a percentage. The percentage represents the
size of the wedge in the pie. For example, if the percentage is
25%, then the wedge is one quarter of the entire pie.

The values associated with wedges can include negative numbers.
When a negative value is provided as a data source, the Pie chart
uses the absolute value of the incoming value to calculate that
wedge's percentage.

### See Also