And we got it wrong. Mark the angle with a small arc. 2. But, if you are reading this - you definitely have a desktop, laptop or mobile device with a web browser. Calculate the measure of ∠ A D B. See the proof below for more on this. Place the compass point at both locations where the arc intersects the angle and draw an arc each time. The right angle is one of the most easily recognizable angles. The value of angle at that time would be the angle between the line segment. One Degree. Radians and degrees measure the same thing, but a complete rotation in degrees goes from 0 to 360° while a complete rotation in radians go from 0 to 2π. To draw a line in AutoCAD you can use the command line length