`document.write ( " Perimeter of a circle of diameter 2 meter = " + Math.PI*2 + " meter ");`

Output of this is here
`Perimeter of a circle of diameter 2 meter = 6.283185307179586 meter`

There are few more constants and here is the list.
Constants | Description |

Math.PI | Value is 3.141592653589793. This is the value of PI used trigonometry |

Math.E | Value is 2.718281828459045, known as Euler's constant |

Math.LN2 | Equal to 0.6931471805599453, natural logarithm of 2 |

Math.LN10 | Equal to 2.302585092994046 natural logarithm of 10 |

Math.LOG2E | Equal to 1.4426950408889633 base 2 logarithm of E |

Math.LOG10E | Equal to 0.4342944819032518 base 10 logarithm of E |

Math.SQRT2 | Equal to 1.4142135623730951 square root of 2 |

Math.SQRT1_2 | Equal to 0.7071067811865476 square root of 1/2 |

Log value of a number

JavaScript Math Reference

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