Making Polygons

I wish it was easier to inscribe an octagon into a square, when the square is oriented parallel to the axes.
JIm

Do you mean a square that is aligned with the xy axis, or do you mean a square generated with the polygon tool?
I did a 4 sided polygon with the tool. Deactivated the tool then started it again specifying 8 sides then pointed to the midpoint of one of the sides on the square. The octagon inscribed with the vertex touching that midpoint.
[EDIT This was generated at origin xyz=0]Then I made an equal sided rectangle. I started the polygon tool set 8 sides hovered over the midpoint on each of two adjacent sides on the square until it inferenced at the geometric center of the square, clicked and dragged the octagon out to the midpoint on a side of the square.
Both methods above will work.The key may be to deactivate the tool by hitting spacebar and starting again.

Here are two ways  I added a temporary diagonal line to find the square's center.
One is maximum size it will snap 'square' when the pointonedge' is approximately square as shown, the other is fully 'inscribed'...
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