The Read Only dialog box displays when the layer that the object resides in is not editable. On the HOME tab, in the Windows group, click Tool Windows, and click Layers from the list, to open the Layers window, where you can specify layer settings.
Center X,Y
The center of the arc's ellipse specified in X and Y coordinates.
Radius X
The horizontal distance from the center of the arc's ellipse to the right most (or left most) point.
Radius Y
The vertical distance from the center of the arc's ellipse to the top most (or bottom most) point.
Start Angle
The angle of the arc's starting point on its ellipse.
End Angle
The angle of the arc's end point on its ellipse. The arc is reshaped to fit the specified starting and ending angles.
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