RT @fermatslibrary: Here is a visual proof of square binomial: (a+b)²= a²+2ab+b² https://t.co/FOj4trswvX

Here is a visual proof of square binomial: (a+b)²= a²+2ab+b² pic.twitter.com/FOj4trswvX

— Fermat's Library (@fermatslibrary) March 9, 2018