Oh, there are even more kinds of angles than there are
kinds of angels. I know all about those. I know everything there is to know about the angle business. Matter of fact, I'm going into the angle business for myself after I get done with writing.
What you do is you just drag your pencil across the page. On a good day, you can get over a hundred radians on a page. If everything goes all right, two pencils drawing ten inches, less what you erase for mistakes, you can make all sorts of angles.
Anyway, like I was saying, angles are the fruit of geometry. You can complement 'em, supplement 'em, bisect 'em, trisect 'em, correspond 'em. There's…uh…angle-finders, congruent angles, adjacent angles, corresponding angles. Acute, right, obtuse, right. There's straight angles, reflex angles, vertical angles, oblique angles, angles and lines, angles and curves.
That's...that's about it.