#include <iostream>
#include <cmath>
using namespace std;
int main() {
double a, b, c, unghi;
//Citire date
cout << "Introduceti a, b, m(C) : ";
cin >> a >> b >> unghi;
//Calculare
c = sqrt(a * a + b * b - 2 * a * b * cos(unghi));
//Afisare rezultat
cout << "Lungimea laturii c este " << c;
}
