Draw a line at a specific angle in AutoCad || Angle relative to another line || 2020 || 2019 || 2018 

At a Specific Angle to Another Line:
Temporarily aligning the UCS icon with an existing line makes it easy to draw a line at a specific angle to another line. At the command prompt, enter UCS. Enter ob for Object and select the existing line.Select Line command and Specify the start point.
Do one of the following to specify the angle:
Enter the left angle bracket and the angle, for example 45, and move the cursor to indicate the direction.
Move the cursor to indicate the approximate angle.
Specify the second point.
Press the Space-bar or Enter.
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