Draw a Guideline Circle or Convert edges to guide lines?

[JClements]

I thought the was a plugin to convert edges to a guideline but couldn't find it.

Or possibly using a circle tool to create a circular guideline?

[pilou]

Xlines by Rick Wilson!
(works for circle! Right Click / Convert to xLines

And the inverse Xlines 2Lines by Tig
(Right Click / Edges from Construction Lines)

[Box]

Or Fredo's excellent Curvizard.

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[pilou]

Yep Fredo the French SU Wizard!

[JClements]

Thank you, one and all!