Our world is so funny.
I really can't imagine any scenario where this would be considered a rational lesson plan unless the point was to demonstrate how Michael Scott would teach a class.
Of course, the student who filmed this thought this was "violence" and the person who posted it to Twitter is trying to get the teacher punished, so this was just a clown show all around.
Apparently, this happened at a high school in California and the teacher was using the phrase "SOH-CAH-TOA" as a mnemonic device in her math lesson.
Again, super weird, but only someone super woke would think it's "violence." What a crazy world we're making!