Here’s the solution I came up with, it’s kinda messy, but I think it works:
- To put forward point
- draw a line from the center of the arc to the point on the arc
- make an arc of the specified length, (bottom right icon in Grace’s picture,) having the same radius as the arc you want to put points on. ETA: with its starting angle being that of the line drawn in the previous step
- segment the arc of the specified length by its own length
- For the back point
- Mirror Objects by Line (ML), in the Operations toolbox
- select the forward point, press enter
- select the line going from the center of the arc to the center point
- Profit!
I hope that makes sense!
