Insert line parallel to other that snaps to tangent of arc nearby

[LGL_Design]

I hope someone can help me.

I need to insert a line that is parallel to AB.

But snaps to the tangent an arc nearby.

Dotted line is just positioned by hand, that that is what I essential want.

Thanks in advance

[paullimapa]

Have you tried using Copy command Line AB with base point by object snapping to endpoint of Line at B and the 2nd point as  object snap Tangent to Arc then Trim section of Line at A that’s not needed?

[imadHabash]

Hi,

The fastest way is to use from Parametric ( GCTANGENT command ) .. Click on below image 

Then you can delete the constraint by DelConstraint command from the same previous menu

[leeminardi · Accepted solution]

Using perpendicular object snap create a line from the center of the arc to line AB. Now copy the line AB from B to the intersection of the perpendicular line and the arc.

[LGL_Design]

If I understand you correctly, then it results in this:

[LGL_Design]

This is 100% what I want to achieve, but I am using AutoCAD LT, it doesn't seem to have full access to parametric constraints as shown in the video / image above.

[LGL_Design]

This worked, perfect, thank you.

[imadHabash]

You're right ... 😉

In AutoCAD LT, parametric drawing technology is limited , While it is not possible to create or edit geometric and dimensional constraints in AutoCAD LT, you can still view, work with, and save constrained drawings.

[LGL_Design]

Thanks for the info.

I suppose the onus is on us (LT users) to find creative work arounds, and share with the community.

[leeminardi]

@LGL_Design  You are welcome. It looks like in your first try the the perpedicular line was not from the center.  Here's what I got.

[-didier- · Accepted solution]

Bonjour @LGL_Design 

Your line is secant, not tangent.

Here is my proposition :

Amicalement

[LGL_Design]

In my first attempt I was replying to someone else.

Your method work perfectly, thanks.

[LGL_Design]

perfect thanks.