In the C program, calculate the area of ​​the inscribed circle of an equilateral triangle

Here we will see the area of ​​the circle inscribed in an equilateral triangle. The side of the triangle is "a".

The area of ​​an equilateral triangle-

The half-perimeter of the triangle is-

So the radius of the circle is -

Example

#include <iostream>
#include <cmath>
using namespace std;
float area(float a) {
   if (a < 0 ) //if the value is negative it is invalid
      return -1;
   float area = 3.1415 * (a/(2*sqrt(3))) * (a/(2*sqrt(3)));
   return area;
}
int main() {
   float a = 4;
   cout << "Area is: " << area(a);
}

Output

Area is: 4.18867

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