New Orleans teenagers found a new proof of the Pythagorean Theorem
I'm with the <i>circular loop</i> crowd. Pythagorean Theorem proofs must exist in geometry terms and not trigonometric terms. To use the dependent math to prove the math will always be true. This is like me saying "I made beer out of old yeast". Yeast being PT in this case. Beer being trig. The proof is using proof to provide proof. <i>sin a</i>. Invalid to me.