The entity summary is actually going to be reading the world ucs. With this setup, you have drawn the arc at a negative "X" value (Which is a negative Z value from the Side UCS.
You can see this by using "Measure" option, which will produce different localized results depending on the active UCS. It will show the negative Z value if you have the side UCS selected, or it will show a negative X value if you are in the others.


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I have been trying to draw in the zy plane. I have set the ucs (y/z) with the check mark and set active. When I draw a arc coordinate x center 0.000, y center 0.000,z center -9.625. radius 9.625, start angle 0.000, end angle 360.000. It draws a circle centered y0,z0. Also movements of the mouse moves ,at the bottom of the screen, x and y only. z does not move.



