zadanie 14 i 15

#include <iostream>
#include <math.h>
#include <string>
using namespace std;
float POLE_TROJKATA(float a, float b);
float POLE_TROJKATA(float x1, float y1, float x2, float y2, float x3, float y3);
int main(){
cout << POLE_TROJKATA(1, 3) << endl;
cout << POLE_TROJKATA(2, 6) << endl;
cout << POLE_TROJKATA(1,1,5,2,2,5) << endl;
cout << POLE_TROJKATA(0,0,3,0,0,3) << endl;
}


float POLE_TROJKATA(float a, float b){
return a*b/2;
}
float POLE_TROJKATA(float x1, float y1, float x2, float y2, float x3, float y3){
    float a = sqrt(pow(x1 - x2, 2) + pow(y1 - y2, 2));
    float b = sqrt(pow(x2 - x3, 2) + pow(y2 - y3, 2));
    float c = sqrt(pow(x3 - x1, 2) + pow(y3 - y1, 2));
    float o = (a+b+c)/2;
    return sqrt(o*(o-a)*(o-b)*(o-c));
}