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@10,30 as the radius - it should read @10.30,0 if you want to get 20.60 as diameter.
Still, if I try it your way I don't get 20.88 but 60.2456.
So I guess you just don't have proper snaps on when measuring so the points are not caught exactly.
Activate Snap on Endpoints, also it is advisable to have Free Snap on.
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