3 ms·Proofs without words1 points by TriinT 17y agojgrahamc 17y agoSimilar: http://www.jgc.org/blog/2008/02/sum-of-first-n-odd-numbers-is-always.html http://www.jgc.org/blog/2008/02/sum-of-first-n-odd-numbers-i...