Geometric geekery

[spudtater]

Non-algebraic proofs of Pythagoras' theorem:
- First an animation. Although it might not be strictly a proof, it's a great demonstration. (Alternate local copy.)
- Then a more thorough proof by tiling. A little less accessible, though.

I want to do geometric proofs! For example,

Is this a proof?

c d a ac ad b bc bd a+b (a+b)(c+d) c+d

Oh, and blah blah Pope blah.

Comments

[sigmonster.livejournal.com]

It's all consistent, and it all fits the real numbers and their extensions. It doesn't have to make sense.

See also: Proof by Intimidation.