sqrtR2

sqrtr2 is an informal label used in some programming contexts and educational materials to denote the square root of 2. It is not a standardized function name in major languages, but rather a shorthand that may appear in examples, pseudo-code, or as a named constant in specific codebases. The value associated with sqrtr2 is the positive real number that satisfies x^2 = 2, commonly written as sqrt(2) or √2, and numerically about 1.4142135623730951.

Mathematically, sqrt(2) is irrational, meaning it cannot be expressed as a ratio of integers. It is the length of the diagonal of a unit square, derived from the Pythagorean theorem. In practice, this constant appears in normalization procedures, geometric computations, and various algorithms that involve Euclidean distances or plane geometry.

In code, sqrtr2 may be defined once and reused as a constant. Examples (illustrative and language-agnostic) include assigning the value 1.4142135623730951 to a variable named sqrtr2 or computing it as sqrt(2) at runtime. Some languages or libraries provide built-in constants for the square root of 2 (for example, Math.SQRT2 in JavaScript), which can be preferable to hard-coded literals. When naming conventions are considered, sqrtr2 is often discouraged in favor of clearer identifiers such as sqrt2, sqrt(2), or M_SQRT2 to improve readability and portability.

See also: sqrt, irrational number, diagonal of a unit square, mathematical constants.