The Math.PI
property represents the ratio of the circumference of a circle to its diameter, approximately 3.14159:
Because PI
is a static property of Math
, you always use it as Math.PI
, rather than as a property of a Math
object you created (Math
is not a constructor).
Math.PI
The following function uses Math.PI
to calculate the circumference of a circle with a passed radius.
function calculateCircumference(radius) { return 2 * Math.PI * radius; } calculateCircumference(1); // 6.283185307179586
Created by Mozilla Contributors and licensed under CC-BY-SA 2.5