Please design a small flag rotation yourself

Solution: This is an open-ended question, but it still revolves around the rotation of a surface (point → line → surface → body)

I'm going to provide a personal answer here for reference only~(just roughly diagramming)

You can try all kinds of triangles by yourself, acute, right, obtuse~

If you're fine with the diagramming you can design a small flag with some simple lengths given to it, and then make a diagram with the correspondence in mind. And then pay attention to the correspondence when you do the drawing~

I hope my answer is helpful to you, thank you~