I’m pretty dumb, so I don’t understand this one.

Pythagorean theorem.

Although, don't solve this or else Pythagoras might throw you off of a boat

Pretty sure this is Pythagorean Identity, theorem is a²+b²=c²
Probably that trigonometry is the highest math the average person will take?
I got to calculus 2 and proceeded to forget everything through algebra II once I took a break from math for a semester.