So I need to offset first, then I can figure out the length? I was thinking more along the lines of working out the length, scaling it up and then offsetting to create a suitable width. It all seems a bit backwards to me!
Would you suggest:
- offsetting by equal amounts either side of the centreline,
- getting the area and length,
- removing the offset,
- then scaling up
- and adding the final offset (track width)?