How to calculate the perimeter and area of a circle using JavaScript

To calculate the perimeter and area of a circle in JavaScript, you need to use the mathematical formulas associated with circles. The formulas are as follows:

Perimeter (also known as circumference) = 2 * π * radius
Area = π * radius^2

Here’s an example of how you can calculate the perimeter and area of a circle using JavaScript:

// Define the radius of the circle
var radius = 5;

// Calculate the perimeter (circumference)
var perimeter = 2 * Math.PI * radius;

// Calculate the area
var area = Math.PI * Math.pow(radius, 2);

// Display the results
console.log("Perimeter: " + perimeter);
console.log("Area: " + area);

In this example, the radius of the circle is set to 5. You can change the value of radius to any desired value.

To calculate the perimeter, the formula 2 * Math.PI * radius is used, where Math.PI represents the mathematical constant π. The result is stored in the perimeter variable.

To calculate the area, the formula Math.PI * Math.pow(radius, 2) is used. The Math.pow() function is used to calculate the square of the radius. The result is stored in the area variable.

Finally, the results are displayed in the console using console.log().

By executing this code, you will obtain the calculated perimeter (circumference) and area of the circle based on the given radius.