pedantic/pə-dăn′tĭk/

adjective

1. Characterized by a narrow, often ostentatious concern for academic knowledge and formal rules.

   “a pedantic attention to details.”

You are very much correct in the fact that angles by definition are only present between straight lines. A secant line that is in the same plane as the circle and is crossing the centre of the circle is called it’s normal and a normal is by definition perpendicular. The meme was fun