Hi Anis,

> Can you give me screenshot sample usage in your project ?

It comes in handy when you are quickly laying out construction curves (not to be confused with MoI construction lines) at angles to keep symmetry and reference, here are some progressive screen shots of a simple layout that I want to keep the two lines central to a rectangle.

We'll start off with the original lines I posted.


Once you've got a bisector line created (thanks to Michael).


You can use it as a reference knowing it is in the center of the two lines.
Then you can do offset operations....


as well as run perpendicular lines.


After a bit of trimming and extending you know that the two lines we started with are central and perpendicular to the blue rectangle.


For this case you could start off symmetrical about the origin and rotate the whole thing at the desired angle once constructed, this is just a simple example, usually I'll use bisector line if the two lines shown are referenced at an angle off another set of curves or lines.

Cheers