01 #include<stdio.h>

02 #include<math.h>

03

04 int main()

05 {

06

07 int side;

08 float area;

09

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

11 scanf("%d", &side);

12

13 area = (float)(sqrt(3)*(side * side))/4;

14

15 printf("nArea of Equilateral Triangle : %.2f", area);

16 return 0;

17 }

OUTPUT :

Enter the Length of Side : 5

Area of Equilateral Triangle : 10.83