Draw diagonal line with a specific offset to another diagonal line

Question

I have a vertical line with a 45° turn. I want to draw another line next to it with a specific offset. What is the best way to do it?

I tried moving the pink anchors directly over the orange anchors and then use the move feature to move it -135° with the specific offset.

But when I move the pink endpoint with shift to move it diagonally, it won't snap perfectly to the vertical line.

In my case, it was off by 0.004 px.

What is a better way to do it?

Answer 1

Object > Path > Offset Path

Then use the Direct Selection Tool (the white arrow) to select and delete unwanted parts of the offset path ....