Find Area of an Equilateral Triangle: C Program

Given the sides of the Triangle, write a C program to calculate Perimeter and Area of a equilateral Triangle.

Related Read:
Find Area of a Triangle Using Its Sides: C Program

Note:
Equilateral Triangle: A Triangle is called equilateral triangle if length of 3 sides of it are equal.
Example: a = 10, b = 10, c = 10;

So we ask the user to input value of the side only once.

Formula To Calculate Perimeter and Area of Equilateral Triangle

Perimeter = a + a + a;
i.e., Perimeter = 3 * a;

Area = ( ( sqrt(3) / 4 ) * pow(a, 2));

where a is the value of side of the Equilateral Triangle.

Find Area of an Equilateral Triangle: C Program

Find Area of an Equilateral Triangle: C Program

#include < stdio.h >
#include < math.h >

int main()
{
    float sides, area, p;

    printf("Enter value for side of Equilateral Triangle\n");
    scanf("%f", &sides);

    p    = 3 * sides;
    area = ( (sqrt(3)/4) * pow(sides, 2) );

    printf("Perimeter is %f\n", p);
    printf("Area is %f\n", area);

    return 0;
}

Output:
Enter value for side of Equilateral Triangle
75
Perimeter is 225.000000
Area is 2435.696533

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