Вычислить углы треугольника

#include<iostream> 
#include<math.h> 
#include<cmath>
#include<conio.h> 
using namespace std;
int main()
{
    float a, b, c, x, z, y;
    cout <<("Vvedite znach a:") << endl;
    cin >> a;
    cout <<("Vvedite znach b:") << endl;
    cin >> b;
    cout <<("Vvedite znach c:") << endl;
    cin >> c;
    if ((a + b < c) || (a + c < b) || (b + c < a)) cout << "ds" << endl;
    x = (pow(a, 2) + pow(c, 2) - pow(b, 2)) / (2 * a * c);
    z = (pow(a, 2) + pow(b, 2) - pow(c, 2)) / (2 * a * b);
    y = (pow(b, 2) + pow(c, 2) - pow(a, 2)) / (2 * c * b);
    cout <<("Ugol treul:");
    cout << "x=" << x << " z=" << z << " y=" << y << endl;
    _getch();
    return 0;
}

x = acos((pow(a, 2) + pow(c, 2) - pow(b, 2)) / (2 * a * c));

x = x * 180 / 3.14;

#include<iostream>
#include<iomanip>
#define _USE_MATH_DEFINES
#include<cmath>
using namespace std;
 
int main()
{
    double a, b, c, alfa, beta, gamma;
    
    cout <<"a="; cin >> a;
    cout <<"b="; cin >> b;
    cout <<"c="; cin >> c;
    
    if (a+b>c && a+c>b && b+c>a)
    {    
    alfa = acos((b*b+c*c-a*a)/(2*b*c))*180/M_PI;
    beta = acos((a*a+c*c-b*b)/(2*a*c))*180/M_PI;
    gamma = acos((a*a+b*b-c*c)/(2*a*b))*180/M_PI;    
    cout <<"Angles in degrees:\n";
    cout <<setprecision(3)<<fixed<< "alfa=" << alfa << " beta=" << beta << " gamma=" << gamma << endl;
    }
    else cout << "Triangle absent\n";
system("pause");
return 0;
}