The Book of JavaScript, 2nd Edition

Math [FF, IE 3]

The math object contains numerous properties and methods. Except where noted, all of these properties and methods work in Firefox, IE 3, and more recent browsers, and all the properties are read-only. Because most of the methods and properties are self-explanatory, I will give few examples. I'll round all numbers to the sixth decimal point.

Properties

E	e, Euler's constant, the base of natural logarithms (2.718282)
LN2	Natural log of 2 (0.693147)
LN10	Natural log of 10 (2.302585)
LOG2E	Base 2 log of e (1.442695)
LOG10E	Base 10 log of e (0.434294)
PI	Pi (3.141593)
SQRT2	Square root of 2 (1.414214)

Methods

abs()	Absolute value of the argument, for example, var ab_value = Math.abs(-10); sets ab_value to 10
acos()	Arc cosine of the argument in radians ...