Q: How come trigonometry gets to have its own name and be its own branch of math, while studying any other shape just gets thrown into the geometry category? is there a name for the study of rhombuses, trapezoids, cones, etc.?
A: all those subjects were categorized and named by humans (people, etc). that's what you are. so you can actually make the names however you want. the only thing is if you want the names to catch on worldwide you might need to be a very influential person world wide