Zadanie 19,20

#include <iostream>
#include <math.h>
using namespace std;
float a,h, xa,ya,xb,yb,xc,yc;

float pole_trojkata(float a, float h){
    return a*h/2;
}
float pole_trojkata(float xa,float ya,float xb,float yb,float xc,float yc)
{
    float p=0.5*sqrt(pow((xb-xa)*(yc-ya)-(yb-ya)*(xc-xa),2));
    return p;
}

int main(){

    cout << "Podaj dlugosc boku: ";
    cin >> a;
    cout << "Podaj wysokosc: ";
    cin >> h;
    cout << "Pole trojkata wynosi: " << pole_trojkata(a,h) << endl;
    cout << endl;
    cout << "Pole dla a3,h6: " << endl;
    cout << pole_trojkata(3,6);
    cout << endl;
    cout << "Pole dla a6,h12 " << endl;
    cout << pole_trojkata(6,12) << endl;
    cout << "Pole dla wspolrzednych" << endl;
    cout << pole_trojkata(0,2,3,1,-1,-5) <<endl;
    cout <<"Podaj xa,ya" << endl;
    cin >> xa;
    cin >> ya;
    cout <<"Podaj xb,yb" << endl;
    cin >> xb;
    cin >> yb;
    cout <<"Podaj xc,yc" << endl;
    cin >> xc;
    cin >> yc;
    cout << pole_trojkata(xa,ya,xb,yb,xc,yc);

    return 0;
}