Hello
you can try to use GetLoopAt() method (Active X)
https://help.autodesk.com/view/OARX/2020/ENU/?guid=GUID-93E21F08-C55A-4D56-9A3B-DEADB29838C0
or using this process (Active X)
then you will have to convert the Autocad objects into ProtoType Objects (be careful when converting the Arc, need use GetBulge() method)
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