#include <iostream>
#include <algorithm>

using namespace std;

#define pi 3.14159265358979

class Polar
{
public:
    double r, a;
    Polar()
    {
        r = 0;
        a = 0;
    }
    Polar(double rad, double angle)
    {
        r = rad;
        a = angle;
    }
    void change_r()
    {
        cout << "Enter new radius: " << endl;
        cin >> r;
    }
    void change_a()
    {
        cout << "Enter new angle: " << endl;
        cin >> a;
    }
    void rad_to_deg()
    {
        a *= 180 / pi;
    }
    void dec()
    {
        cout << "x: " << r*cos(a)<<endl;
        cout << "y: " << r*sin(a) << endl;
    }

};

void dist(Polar A, Polar B)
{
    cout << sqrt(A.r*A.r + B.r*B.r - 2 * A.r*B.r*cos(max(A.a, B.a) - min(A.a, B.a))) << endl;
}
void check(Polar A, Polar B)
{
    if (A.a == B.a && A.r == B.r)
    {
        cout << "Coincidence" << endl;
    }
    else {
        cout << "Non-coincidence" << endl;
    }
}

int main()
{
    Polar A, B(1,2);
    A.change_a();
    A.change_r();
    A.dec();
    dist(A, B);
    check(A, B);
    A.rad_to_deg();
    system("pause");
    return 0;
}