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enter image description here

how to draw a relative circle like this not by pgf pie

  • Why not using pgf? That is the simplest way of doing it.... – Alex Jan 20 '20 at 16:33
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    You may use https://tex.stackexchange.com/a/515772 as a starting point. It links to earlier posts of this type. –  Jan 20 '20 at 16:35
  • for scientific figures like that, 3D or fake-3D is not necessary. Of course, with plain TikZ, we can draw easily. Also you should provide a MWE. – Black Mild Jan 21 '20 at 15:21

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