## C Program to Calculate Area of Equilatral Triangle

## C Program for Beginners : Area of Square

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | #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 :**

1 2 | 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.

1 | 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.

1 | area = r_4 * side * side ; |

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