The poor Scarecrow went all the way to Emerald City to see the Wizard for a brain. In lieu of a brain, the Wizard gives the Scarecrow an honorary degree. The Scarecrow then immediately misquotes the Pythagorean theorem. *facepalm*
We can only assume that the Scarecrow meant “the square of the hypotenuse of a right triangle is equal to the sum of the squares of the remaining sides”. To be fair, it’s a common mistake. The same thing has happened to Homer Simpson. Unknown still, is whether the mistake was intentional as a joke at the Scarecrow’s expense, or if the Wizard of Oz’s writers really just didn't know their geometry.
19 Amazing Facts