# 1. Introduction

Calculating the area of geometric shapes is a fundamental task in mathematics and programming. The area of a circle can be found using the formula π * r^2, where r is the radius of the circle. In this guide, we'll implement a TypeScript function to compute the area of a circle given its radius.

# 2. Program Overview

We'll be creating a function named calculateCircleArea that will take the radius of the circle as an argument. The function will return the computed area of the circle using the aforementioned formula.

# 3. Code Program

``````// Function to calculate the area of a circle given its radius
// Using the Math.PI constant to get the value of π
}

// Testing the function
``````

### Output:

```The area of a circle with radius 5 is: 78.54
```

# 4. Step By Step Explanation

1. We define a function named calculateCircleArea that accepts the radius of a circle as its parameter.

2. Inside the function, we use the Math.PI constant to get the value of π (Pi).

3. We compute the area of the circle using the formula π * r^2 and return the result.

4. For testing purposes, we use a circle with a radius of 5 units.

5. When invoking the function with a radius of 5, it calculates and outputs the area as 78.54 square units (rounded to two decimal places).