W3cubDocs

/JavaScript

Math.SQRT1_2

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

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

Try it

Property attributes of Math.SQRT1_2
Writable no
Enumerable no
Configurable no

Description

Math.SQRT1_2 is a constant and a more performant equivalent to Math.sqrt(0.5).

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

Browser compatibility

Desktop Mobile Server
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet Deno Node.js
SQRT1_2
1
12
1
3
3
1
4.4
18
4
10.1
1
1.0
1.0
0.10.0

See also

© 2005–2022 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/SQRT1_2