#include
#include
using namespace std;

int main()
{
    const int m=8;
    int n[m] = {2,3,2,4,4,5,2,3},
        h[m] = {4,5,12,3,10,11,10,6};
    double a = 30*M_PI/180, H = 0;
    for (int i=0; i < m; i++){
        a = asin(sin(a)/n[i]);
        H += h[i]*tan(a);
    }
    cout << "alfa = " << a*180/M_PI << endl;
    cout << "H = " << H << endl;
    system("PAUSE");
    return 0;
}

Результат:
alfa = 0.00497359
H = 2.0175