Measuring the "Angle" between Curves/Arcs

[stopandgo]

I have two identically-drawn arcs, with their midpoints centered on the same x/y point. One of these arcs has been slightly rotated about that midpoint by some "R degrees".

 

My question is, how do I find out what this angle is? In other words, I want to find some angle "R" so that if I rotate one of the two arcs by it, they will both be perfectly in line.

 

Seems like there's a simple facepalm solution here that I'm not seeing. Angular dimension to measure the angle obviously doesn't work since they are curves. Any ideas?

[stopandgo]

OK scratch that, I came up with the answer. Just drew lines from the rotation point (midpoint) to the ends of each arc, then measured the angle between these lines. Gives the angle required to rotate one of the curves onto the other.

 

Another way, if you weren't looking for the angle so much as just wanting to overlap the lines, would be to use 3DALIGN command, with the rotation point and ends of the curves as the reference points.

 

Welp, although a premature new thread I guess this could be used as a future reference for someone else.

[Patrick Hughes]

Another option would be to use the Reference option during the rotate command. Takes a little practice but well worth the effort.

[rkent]

Give the assumptions I would simply erase the offending arc and copy another one on top of the remaining one, adjust layers if appropriate.

[Dana W]

Just erase one, mirror the other.