It's super common for people to reach for trig to solve geometry problems when they should be using vector arithmetic instead, eg this answer on SO has to speci

It's super common for people to reach for trig to solve geometry problems when they should be using vector arithmetic instead, eg this answer on SO has to special-case vertical/horizontal lines, which can be avoided entirely if it didn't reach for trig in the first place. https://stackoverflow.com/a/63673261 https://stackoverflow.com/a/63673261 I think this is the sort of situation that GP is referring to.