In this post, we will learn **how to find the area of an equilateral triangle using the C** Programming language.

A triangle having all the sides equal and each angle equal to **60** degrees is called an **equilateral triangle**.

The formula to calculate the area of an equilateral triangle is: **Area of Equilateral Triangle = (√3/4) * (side) ^{2}**.

We will use this formula in our program to find the area of an equilateral triangle.

So, without further ado, let’s begin this tutorial.

**C Program to Find Area of an Equilateral Triangle**

// C Program to Find Area of an Equilateral Triangle #include <stdio.h> #include <math.h> int main(){ float side, area; // Asking for input printf("Enter the side of an equilateral triangle: "); scanf("%f", &side); // Calculating area of equilateral triangle area = (sqrt(3) / 4) * (side * side); // Display result printf("Area of the triangle = %.2f", area); return 0; }

**Output**

```
Enter the side of an equilateral triangle: 9
Area of the triangle = 35.07
```

**How Does This Program Work?**

float side, area;

In this program, we have declared **two floating data type** variables named **side** and **area**.

// Asking for input printf("Enter the side of an equilateral triangle: "); scanf("%f", &side);

Then, the user is asked to enter the side of the equilateral triangle. This gets stored in the **side **named variable.

// Calculating area of equilateral triangle area = (sqrt(3) / 4) * (side * side);

We calculate the area of the equilateral triangle using the formula: **area = (√3/4) * (side) ^{2}**. Here, the

**sqrt()**function is used to find the square root of a number. It is defined in the

**math.h**header file.

// Display result printf("Area of the triangle = %.2f", area);

Finally, the area of the equilateral triangle is displayed on the screen using the **printf()** function. We have used **%.2f** format specifier to limit the area to **2** decimal places.

**Conclusion**

I hope after going through this post, you understand **how to find the area of an equilateral triangle using the C** Programming language.

If you have any doubt regarding the program, then contact us in the comment section. We will be delighted to assist you.

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