Trimming a circle

hai , i would to ask, why when i trim a circle, the result seems to have the leftover that is not being trimmed ? How do i solve this ?

I assume that this is just a rough rendering mesh, which you can make more dense from the Rhino options > Mesh > Smooth and slower.

You may want to run the ! _RefreshShade command just in case.

If you still have troubles, another possibility worth trying is the ! _RebuildEdges command.

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thank you ! i will try !