Creating vertical line on circle in side point

Hello,

Could you help me please?
I would like to create vertical red line on circle as shown on the scheme below.
The line should be created in right side point. I can not find this point.

Best regards

Hello
something like that will do the job. Or XZ plane or xy … depending on the plane of the curve and the direction you have for “gravity”

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Yes it is. I’ve been looking for a suitable command for a long time. Thank you very much.