The JavaScript Math PI property

In JavaScript, the mathematical constant PI is stored in the Math object’s static property:

// returns 3.141592653589793

You can use the value of Math.PI to find the Diameter when you know the Circumference:

// Diameter = Circumference / π
let circumference = 20
let diameter = circumference / Math.PI

You can find the Circumference by multiplying the PI with the Diameter:

// Circumference = π X Diameter
let diameter = 9
let circumference = Math.PI * diameter

Finally, you can calculate the Radius of a circle if you know the Circumference:

// Radius = Circumference X 2π
let circumference = 17;
let radius = circumference * (2 * Math.PI)

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