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# How to Calculate Area of Equilatral Triangle using C Language

```
#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 :

Equilateral triangle is a triangle in which all three sides are equal . All angles are of measure 60 degree 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 ;
```

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