Mesh for FEM

Hi guys, does anyone know how I could create a perfectly symmetrical mesh? It is a quarter cylinder of aluminum with a plexiglass hole and I would like to create a transition from the external square to the internal circle (mesh quad) : do you have any ideas? Are there components that are right for me?

If you split your surface, then join it again into a polysurface, you could use QuadRemesh with UseSurfaceEdges set to strict to get something like this:


You are Big.

And if I would a symmetry?

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