How do I extrude with a hole?

[Nakilon]

Since the "Help Docs" link is broken I'm trying to figure out how to use it rather via trial and error. For example, I want to design a triangular nut like this:

I use the tool deployed here: https://autodrop.cloud/jsketcher/ So I create a Plane, then Sketch with three helper lines that I mark as "exclude from 3d operations".

But when I "select a face" to Extrude, it does not realise the circle is cut out, and it results in:

How am I supposed to extrude a thing with a hole? Do I need to make two sketches and then combine them somehow? I