How to convert polygon rings to latitude and longitude

[EkaSetiawan]

I'm Mobile Flutter developer.

How to convert polygon rings to latitude an longitude?
I using google map widget to displaying map. But, polygon rings coordinate is not match with google map coordinate.

[MarkBaird]

Look at Project method on the GeomeryEngine class.  This allows you to convert from one coordinate system to another.

GeometryEngine (ArcGIS Runtime SDK for Android 100.6.0) 

So if your geometry is in Web Mercator and your want to convert to Lat / Long then your output spatial reference is WGS84.

Does this help?