Your description is far away from what I can understand or reproduce. I do not like to guess. So please tell me exactly what you try to do.
-> Tell me the uniqe two letter code, like "li" for "line", "ar" for "arc".
Tell me what the command line say.
Maybe just enter "2.5" if the command line asks you:
"Specify end angle or [Angle/chord Length]": 2.5 <ENTER>
Or "60" for 60 degree or 90 for 90 degree (1/4 circle).
apjjr wrote:I specify the entity, the radius and try to put in a relative angle on the command line, i.e.; degrees of arc, and it will not finish the arc. I press the space bar and enter @2.5 for 2.5 degrees. What am I doing wrong?