Create a perimeter that circumscribe more polygons

Hi everyone, I am new in this forum and at the begginer with Grasshopper.
I would expose this question: starting with 3 poligons (or more) I want to create a perimeter that circumscribe them (like in picture). What is the simple an faster way to get this?

Hello
this is Named Convex Hull, here in 2D.
Using Delaunay 2D with points from polygons will generate a Convex Hull mesh.

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Thank you very much! It works!