Math.SQRT1_2

The Math.SQRT1_2 property represents the square root of 1/2 which is approximately 0.707:

$$\mathtt{\mi{Math.SQRT1_2}} = \sqrt{\frac{1}{2}} = \frac{1}{\sqrt{2}} \approx 0.707$$

Description

Because SQRT1_2 is a static property of Math, you always use it as Math.SQRT1_2, rather than as a property of a Math object you created (Math is not a constructor).

Examples

Using Math.SQRT1_2

The following function returns 1 over the square root of 2:

function getRoot1_2() {
  return Math.SQRT1_2;
}

getRoot1_2(); // 0.7071067811865476

Specifications

Specification	Status	Comment
ECMAScript 1st Edition (ECMA-262)	Standard	Initial definition. Implemented in JavaScript 1.0.
ECMAScript 5.1 (ECMA-262) The definition of 'Math.SQRT1_2' in that specification.	Standard
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'Math.SQRT1_2' in that specification.	Standard
ECMAScript 2017 Draft (ECMA-262) The definition of 'Math.SQRT1_2' in that specification.	Draft

Browser compatibility

See also

• Math.pow()
• Math.sqrt()