About PiNumpad. The Square Root Of 2

PiNumpad is a free memory trainer for the square root of 2 (1.41421356237309...), the square root of 2, the first known irrational number. This page explains how the square root of 2 is implemented in the trainer, grouping logic, colour coding, and anything specific to this constant.

About this constant on PiNumpad. The About page explains how this particular constant is implemented in PiNumpad: how the digits are grouped, what the colour coding means, and any notes specific to this constant that differ from the others.

The irrationality of √2 was proved by the ancient Greeks, legend has it that the discovery so disturbed the Pythagoreans that they drowned the mathematician who found it. It appears in geometry, signal processing, and the diagonal of any unit square. Check this page if you are new to PiNumpad and want to understand the grouping logic before you start, or if you are switching from another constant and want to understand the differences.

PiNumpad is designed for geometry students, engineers, computer scientists, and anyone interested in the history of mathematics and irrational numbers. It runs entirely in the browser with no account, no installation, and no cost. Progress is saved locally using your browser's storage.

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