does rhino api differ from the rhino version?
for example can trinagle2d in rhino.geometry compatible in rhino6?
You can see when features were introduced in RhinoCommon by looking at the “available since” entry for every property and function. For example this constructor has been available since 7.1
https://developer.rhino3d.com/api/rhinocommon/rhino.geometry.triangle3d/triangle3d
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Another helpful link that I discovered recently was the “Whats New” page in the RhinoCommon docs:
https://developer.rhino3d.com/api/rhinocommon/whatsnew/8.0
If you change the 8.0, to 8.1, or 8.2 you can see what each release is adding.