ArcGIS Pro 3.0 API Reference Guide
ArcGIS.Core.Geometry Namespace / EllipticArcBuilderEx Class / SetRadius Method

SetRadius Method
Overload List
OverloadDescription
Sets the radius of a circular arc. If the arc is not circular, sets both the semi-major and semi-minor axes to the same value.  
Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

ArcGIS Pro version: 2.9 or higher.
See Also