How can I make a polyline using two different points?

basically I have a box, I’m using two of his faces with the node area to get the centroid, and then I get two different points, which then I can’t add to the polyline node, problably I should use a node that groups them, but group node isn’t working, what can I use then?

very unclear description, and some random self created concept such as node area.
what is node area?

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