C Program to Calculate Area of Equilatral Triangle?

Answer 1

#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