radius is not equalling the correct diameter

hello,
I'm creating a simple centre point circle and I'm specifying @10,30 as the radius but when I measure the circle it's diameter is coming out at 20.88

what am I doing wrong here please?

thanks
Zac

@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.

perfect thank you!

saved me a lot of time. @10.30,0 worked

zac