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The JavaScript FAQ
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Math Constants

Question: How do I handle mathematical constants in JavaScript?

Answer: Some mathematical constants are predefined in JavaScript. You can write these constants as follows:

Math.PI      // pi = 3.14159265...
Math.E       // e = 2.71828182...
Math.LOG2E   // log of e base 2
Math.LOG10E  // log of e base 10
Math.LN2     // log of 2 base e
Math.LN10    // log of 10 base e
Math.SQRT2   // square root of 2
Math.SQRT1_2 // square root of 1/2
Thus, there is no need to remember the exact numerical value of e or pi. Just use Math.E or Math.PI! Copyright © 1999-2006, Alexei Kourbatov

The JavaScript FAQ
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  Mirrored with kind permission of Alexei Kourbatov Design by Interspire