# The Square Root of Two Is Called “Pythagoras’ Constant.”

The Square Root of Two Is Called “Pythagoras’ Constant.”

Statue of Pythagoras ( Pitagora ) in Rome, Italy

Surely, you remember the Pythagorean Theorem from your 10th grade geometry class, but have you ever heard of Pythagoras’ Constant? Well, here’s the lowdown: The square root of 2 (1.41) is known as Pythagoras’ Constant. It’s also the very first irrational number ever to be discovered.