On Screen Protractor

A handy program for measuring the pixel dimensions of something on-screen is screen ruler: sudo apt install screenruler ; screenruler I like how you can place it anywhere on your screen and it stays on top of all other applications as you use it. I'm hoping to find something similar to this that's a protractor instead of a ruler. I searched for "protractor" in the repository of Debian 11 and got no results: sudo apt-cache search "protractor" Such a tool would be great for measuring angles on-screen. However, ultimately, I will likely need something that can actually draw a line based on a specified angle. Hopefully I won't have to learn something as sophisticated as AutoCad in order to accomplish this. What's the simplest way to measure and draw angles in Linux?