C program to Find the Area of an Equilateral Triangle

In this C Programming example, we will implement the program to find the area of an equilateral triangle and print the output on the console.

1. What is an equilateral triangle and how to find its Area?

A Triangle with all angles at 60 degrees and congruent sides or an equiangular triangle is described as Equilateral Triangle.

In an equilateral triangle, median, angle bisector, and altitude for all sides are all the same.

The area of an equilateral triangle is √3 a²/ 4.

Example
Input:
side = 3

Output: 
The Area of Equilateral Triangle is: 3.892500

Helpful topics to understand this program better are-

• Data Types in C
• Console Input / Output in C
• Functions in C

2. C Program to find the area of an equilateral triangle

Let’s discuss the execution(kind of pseudocode) for the program to find the area of an equilateral triangle in C.

1. Initially, we prompt the user to enter the side of the equilateral triangle.
2. The value is stored in the int side and the value of the area of the triangle is stored in the float area.
3. Now, the side length is used for the calculation in the formula area = ( 1.73 * side * side) / 4.
4. After the calculations, the value is stored in the float area and use this variable to print the output.

Let us now implement the above execution of the program to find the area of an equilateral triangle in C.

#include <math.h>
#include <stdio.h>
int main() {
  int side;
  float area;
  printf("\nEnter the side of the triangle: ");
  scanf("%d", &side);

  area = (1.73 * side * side) / 4;

  printf("\nThe Area of an Equilateral Triangle is: %f", area);
  return (0);
}

Output

Enter the side of the triangle: 6
The Area of an Equilateral Triangle is: 15.570000

3. Conclusion

In this C Programming example, we have discussed how to find the area of an equilateral triangle in C.

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