Area of circle which is inscribed in equilateral triangle | C ++ program to find the area of circle which is inscribed in equilateral triangle ; Function return the area of circle inscribed in equilateral triangle ; Driver code
# include <bits/stdc++.h> NEW_LINE # define PI  3.14 NEW_LINE using namespace std ; float circle_inscribed ( int a ) { return PI * ( a * a ) / 12 ; } int main ( ) { int a = 4 ; cout << circle_inscribed ( a ) ; return 0 ; }