find the area of a circle in javascript

To find the area of a circle in JavaScript, you need to use the formula A=πr^2, where A is the area and r is the radius of the circle. Here is the JavaScript code to find the area of a circle:

index.tsx
// Function to find the area of a circle
function findAreaOfCircle(radius) {
   const pi = 3.14159;
   const area = pi * radius * radius;
   return area;
}

// Example usage
const radius = 5;
const area = findAreaOfCircle(radius);

console.log(`The area of a circle with radius ${radius} is ${area}.`);
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In this example, we define a function called findAreaOfCircle that takes a parameter radius. Inside the function, we define a constant variable pi and use it to calculate the area using the formula A=πr^2. Finally, we return the calculated area.

To use the function, we declare a variable radius and call the function with radius as the argument. We then log the result to the console using a template literal.