Have you ever worked with an angle with decimal precision? Let’s say you want to create a line with 22.5 deg. You typed the angle, but when you see the properties, the angle is round up to 23 deg.
You may also try to add the polar tracking settings, but the angle is also round up.
Don’t worry; AutoCAD still maintains the decimal precision. If you try to create angular dimension to that particular line, you will still see 22.5 deg.
However, it might be inconvenient for you. You want to be confident when you draw with that particular angle.
The angular precision display is controlled by AUPREC system variable. The default value is 0. It means no decimal value is shown. Change the system variable to 1 if you want to see one decimal number, 2 if you want to see two decimal numbers.
AUPREC system variable only affects the display precision of angles. It doesn’t affect the actual precision. And it doesn’t affect the angular dimension precision, as it’s controlled by different system variable (LUPREC).