Get plane from planar curve or arc?

Grasshopper can seemingly recognize “planar curves”, or at least the tool tips I’ve looked at says so.

Does that mean that there’s a node to extract the plane from a planar curve (and thus hopefully also an arc?

“Planar” component is what you need.
It will give you a boolean true/false if the curve is planar, the most fitting plane (even if not planar), and the deviation.

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