JavaScript Math.PI Property

1. Syntax of Math.PI
2. Example 1: Use Math.PI Property to Get Circumference of a Circle
3. Example 2: Use Math.PI Property to Get Surface Area of a Circle
4. Example 3: TypeError Shows When Math.PI Is Used as a Function

In Mathematics, PI is considered the constant and is presented in the Greek letter P as π. It represents the ratio of the circumference of a circle to its diameter, whose approximate value is 3.1415.

JavaScript provides Math.PI property to work with PI.

Syntax of Math.PI

Math.PI

Parameters

The Math.PI property does not accept any parameter.

Return

The Math.PI property returns PI’s value of approximately 3.1415.

Example 1: Use Math.PI Property to Get Circumference of a Circle

function circumferenceOfCircle(radius) {
    return Math.PI * (radius + radius);
  }

console.log(Math.PI)
console.log(circumferenceOfCircle(5))

Output:

3.141592653589793
31.41592653589793

First, we print the value of PI with the help of the Math.PI property.

Second, one common task often performed with PI is calculating the circumference of a circle. It is the linear distance of a circle.

To calculate it, we create a function that accepts radius as the parameter and then uses the PI * (radius + radius) formula to return the calculated result. Finally, when we call this function with the radius, it gives us the circumference of a circle.

Example 2: Use Math.PI Property to Get Surface Area of a Circle

function areaOfCircle(radius) {
    return Math.PI * (radius * radius)
  }

console.log(areaOfCircle(5))

Output:

78.53981633974483

The surface area of a circle means the amount of area a circle has covered. The formula for calculating it is PI * (radius * radius).

We declare a function that takes the radius of a circle as the parameter and returns the surface area of a circle after calculating it.

Example 3: TypeError Shows When Math.PI Is Used as a Function

valueOfPI = Math.PI()

console.log(valueOfPI)

Output:

TypeError: Math.PI is not a function

The property of an object stores values; on the other hand, a function is something that can perform a certain action. A function is known as the method when it is used in an object.

If we use this property as a function, a TypeError will show.