**C program for area of equilateral triangle**

**Formula of area of equilateral triangle:**

Area = (√3)/4 * a

^{2}**C code:**

#include<stdio.h>

#include<math.h>

int main(){

float a;

float area;

printf("Enter size of side of the equilateral triangle : ");

scanf("%f",&a);

area = sqrt(3)/4*(a*a);

printf("Area of equilateral triangle is: %.3f",area);

return 0;

}

**Sample output:**

Enter size of side of the equilateral triangle: 5

Area of equilateral triangle is: 10.825

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