It is so embarrassed telling the truth here, although I have been using sketchUp for quite a long time, but recently just noticed that it's a very useful command, which is to divide a line or arc into equal segments.
So, from now on, I can throw my calculator away from and desk and say bye bye.
Here is the demonstration step by step. Let's feel free to test it out.
- First, you need to right click on the line or arc to display the menu (blue arrow, click on the "divide"),
- you will see some red-spots, moving left-right or key in the number of segments you would like to have.
- Draw lines to split the surface.