hello there, I’m trying to find centers of rotation for movable pieces, I manually scketchs some arcs to get an aproximation.

Is there a way where one can pick start - end points and then a angle range to obtain the center of the arc?

In the image below, I know the initial and final position of the piece which rotates 270 degrees from the center I want to locate.

I’ve been testing to imput the degree value on each arc and circle command but no results yet.

**Update**

I tried other approach with perpendicular lines from midpoint between 2 pairs of ends

and it works but is a little tricky

Using the arc could be more simple or fast I believe.

**Update 2**

Using circle from diameter in those two pairs of ends, gave me the same result in the intersection. pretty fast, pretty easy.