zad19,20

#include <iostream>
#include <cmath>
float pole,a,b,c,p,s;
using namespace std;

float pole_trojkata(float a, float b)
{
    pole = (a*b)/2;
    return pole;
}
float pole_trojkata(float xa,float ya,float xb,float yb,float xc,float yc)
{
   a = sqrt((xb-xa)*(xb-xa) + (yb-ya)*(yb-ya));
   b = sqrt((xc-xb)*(xc-xb) + (yc-yb)*(yc-yb));
   c = sqrt((xa-xc)*(xa-xc) + (ya-yc)*(ya-yc));
   p = (a+b+c)/2;
   s = sqrt(p * (p-a) * (p-b) * (p-c));
   return s;
}

int main()
{
    cout << "Przykladowe pole trojkata wzorem zwyklym: " << pole_trojkata(4,4)<< endl;
    cout << "Przykladowe pole trojkata wzorem Herona: " << pole_trojkata(0,1,0,0,1,0)<< endl;

    return 0;
}