ArcGIS Pro 2.7 API Reference Guide
PieChartRendererDefinition Class
Members 

ArcGIS.Desktop.Mapping Namespace : PieChartRendererDefinition Class
Represents a pie chart renderer definition to show indivudal amounts by category by their relative proportion (to the total of all amounts).
Object Model
PieChartRendererDefinition ClassCIMColorRamp Class
Syntax
public class PieChartRendererDefinition : ChartRendererDefinition 
Public Class PieChartRendererDefinition 
   Inherits ChartRendererDefinition
Remarks
Pie charts are most effective when there are only a few categories
Inheritance Hierarchy

System.Object
   ArcGIS.Desktop.Mapping.LayerDrawingDefinition
      ArcGIS.Desktop.Mapping.RendererDefinition
         ArcGIS.Desktop.Mapping.ChartRendererDefinition
            ArcGIS.Desktop.Mapping.PieChartRendererDefinition

Requirements

Target Platforms: Windows 10, Windows 8.1

See Also

Reference

PieChartRendererDefinition Members
ArcGIS.Desktop.Mapping Namespace