Geometry: Area of a Hexagon
The code has been modified slightly and now uploaded to the site.

44.cpp
#include <iostream>
#include <cmath>
using namespace std;
int main(){
double area;
double s;
std::cout << "Enter the side: \n";
std::cin >> s;
area = (6 * pow(s, 2)) / (4 * tan(M_PI / 6));
std::cout << "The area of the hexagon is " << area << "\n";
}