# Math constants

There are several constants used in JavaScript which we can use in our calculation. Let us see how to calculate the perimeter of a circle of radius 2 meter.
``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

Subscribe to our YouTube Channel here

## Subscribe

* indicates required
Subscribe to plus2net

plus2net.com