a² + b² = c²

[waivej]

Cute... It reminds me of proofs my father designed into a barn he built years ago.

http://waiveris.com/project/fractals/barnwindows/

[blahedo]

I like that it's animated; nearly every static "visual proof" of the Pythagorean theorem is nearly incomprehensible to me without a lot of explanation---I'm a huge fan of visual proofs but for most of them you really need a time dimension to make sense of them.

[okmjuhb]

Another cute way that's more obviously correct without translations is to consider a square with sides of length a+b. You get an interior square of area c^2 and 4 right triangles with legs of size a and b.

[vog]

Nice animation, but I think in the last step when c² is mentioned (after "a² + b²"), the c-square should be restored such that it is again visible as square.

[mkramlich]

now let's do this for the rest of the education field!

[jgg]

If you like this sort of thing, definitely check out this book: http://www.amazon.com/Proofs-without-Words-Exercises-Classro...