C Program to Calculate Area of Equilatral Triangle

#include<stdio.h>

#include<math.h>

 

int main() 

 {

   int side;

   float area, r_4;

 

   r_4 = sqrt(3) / 4;

 

   printf("\nEnter the Length of Side : ");

   scanf("%d", &side);

 

   area = r_4 * side * side;

 

   printf("\nArea of Equilateral Triangle : %f", area);

   return (0);

}

Output :

Enter the Length of Side : 5

Area of Equilateral Triangle : 10.82

Properties of Equilateral Triangle :

 

1. Equilateral triangle is a triangle in which all three sides are equal .
2. All angles are of measure 60 degree
3. A three-sided regular polygon

Formula to Calculate Area of Equilateral Triangle :

Explanation of Program :

First of all we have to find the value of Root 3 / 2. So we have used following statement to compute the value.

r_4 = sqrt(3) / 4 ;

Now after computing the value of the Root 3 by 2 we have multiplied it by Square of the side.

area = r_4 * side * side ;