In the C program, what is the area of ​​a circle inscribed in a rhombus?

Here we will see the area of ​​a circle inscribed in a rhombus. The diagonals of the rhombus are 'a' and 'b' respectively. The radius of the circle is h.

Two diagonals form four equal triangles. Each triangle is a right triangle, so their area is -

Each side of the rhombus is the hypotenuse -

Therefore, the area of ​​the circle is -

#include <iostream>
#include <cmath>
using namespace std;
float area(float a, float b) {
   if (a < 0 || b < 0) //if the values are negative it is invalid
      return -1;
   float area = (3.1415 * (a*b * a*b))/(4 * (a*a + b*b));
   return area;
}
int main() {
   float a = 8, b= 10;
   cout << "Area is: " << area(a, b);
}

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Area is: 30.6488

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