Re: Lofting?
To split a circle, select "Modify 2d > Split".
Then you have some options, you can split it manually (must have some other geometry crossing at the points where you want to split it), or you can do it into equal sections by selecting "segments" in the menu. For a square, you'll need 4 segments.
It will split it into equal length sections. You might have to rotate it to get what you want.
You can see where it's split by turning on Vertices in the Show menu under workplanes.
Hope this helps.
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