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# Area of circle which is inscribed in equilateral triangle in C Program?

Here we will see the area of circle which is inscribed in an equilateral triangle. The sides of the triangle are ‘a’.

The area of equilateral triangle −

The semi-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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