JavaScript Program to Find Area of a Circle

To find area of a circle using javascript, we will be using simple formulae of calculating the area of circle. The formula used is: Area = ? × r² where r is the radius and ? is a constant value pi.

In this article, we are having radius of the circle and our task is to find the area of the circle using JavaScript.

Example

let radius = 10 and ?(pi) = 3.1415926535
Area = ? × r²
Area= 3.1415926535 * 10 * 10
Area= 314.15926535

Steps to Find Area of Circle

• We have stored radius of circle and pi value in variable radius and pi.
• Then we have defined a function areaCircle() to find the area. It takes p and r as arguments which represents pi and radius respectively.
• It returns the area of circle by multiplying pi with square of radius.
• The area of the circle is calculated by calling the areaCircle() function and passing pi and radius as arguments.
• The output is displayed in web console using console.log().

Example 1

This example demonstrates the implementation of the above steps to find the area of the circle using JavaScript.

let radius = 10;
let pi = 3.141592653589793238;
function areaCircle(p, r){
    return p *r *r;
} 
let area = areaCircle(pi, radius)
console.log("The area of the circle is: " + area);

Example 2

In this example, we have used Math functions for pi value and to calculate the square of radius using Math.PI and Math.pow() respectively.

let radius = 10;
let pi = Math.PI;
function areaCircle(p, r){
    return p * Math.pow(r, 2);;
} 
let area = areaCircle(pi, radius)
console.log("The area of the circle is: " + area);

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