I had a question recently about making measurements in graph units: length measurements of segments and arcs, radii of circles and arcs, and circumferences of circles.

Some time ago I created a set of custom tools to make measurements based on a defined unit distance, and you could certainly use these tools by first creating a unit-distance measurement based on your coordinate system. But this is a bit of extra work that the tool could take care of, so I created the four requested tools (length of a segment, radius of a curved object, circumference of a circle, and length of an arc).

I hope some users may find that these tools save a bit of time and trouble. The tools are here:

Happy Sketching,