My follow up question: How can I use a pivot circle instead of a pivot point

Question

At this moment, I have this:

What is the most efficient way to achieve a quad as cut section, where

• all the faces as well as the unselected vertices are duplicated and overlapping
• but share the same vertices (selected).

The cut section would look like this:

My follow up question: How can I use a pivot circle instead of a pivot point

Question

At this moment, I have this:

What is the most efficient way to achieve a quad as cut section, where

• all the faces as well as the unselected vertices are duplicated and overlapping
• but share the same vertices (selected).

The cut section would look like this:

Question

At this moment, I have this:

What is the most efficient way to achieve a quad as cut section, where

• all the faces as well as the unselected vertices are duplicated and overlapping
• but share the same vertices (selected).

The cut section would look like this:

My follow up question: How can I use a pivot circle instead of a pivot point

Question

At this moment, I have this:

What is the most efficient way to achieve a quad as cut section, where

• all the faces as well as the unselected vertices are duplicated and overlapping
• but share the same vertices (selected).

The cut section would look like this: