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Math.sqrt(x)

Arguments

x

A nonnegative integer.

Returns

The square root of x, or NaN if x is less than 0.

Description

The sqrt( ) method returns the positive root of its operand (even though there may also be a mathematically valid negative root). It is equivalent to:

Math.pow(x, 0.5)

Example

Math.sqrt(4);    // Returns 2, although -2 is also a valid root
Math.sqrt(36);   // Returns 6, although -6 is also a valid root
Math.sqrt(-20);  // Returns NaN
   
// Calculate the distance between two points,
// the square root of (deltaX squared plus deltaY squared):
var dist = Math.sqrt((deltaX * deltaX) + (deltaY * deltaY));

See Also

Math.pow( ), Math.SQRT2, Math.SQRT1_2

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