How to put radian in theodolite?

There are two ways to understand your question, maybe you didn't express it clearly.

First of all, the radian you refer to describes the angle.

Convert the radian system into an angle value, that is, rad into degrees, minutes and seconds that we are familiar with and commonly used in measurement, and then set out with theodolite.

Another way to understand your problem is that radian is the radian of a curve.

I understand what you mean should be the second case.

In this case, there are circular curve layout and transition circular curve layout. You can set out by calculating the central angle of the arc, and you can use the theodolite total station. If you still don't understand, you can contact me