#include <stdio.h>
#include <math.h>
 
int main(void)
{
    double xA, yA, xB, yB, xC, yC, S; // описание переменных
    printf("Coordinates of point A:\n"); //ввод координат вершин треугольника
    scanf("%lf %lf", &xA, &yA);
    printf("Coordinates of point B:\n");
    scanf("%lf %lf", &xB, &yB);
    printf("Coordinates of point C:\n");
    scanf("%lf %lf", &xC, &yC);
    S=fabs((xB-xA)*(yC-yA)-(xC-xA)*(yB-yA))/2.0; //вычисление площади
    printf("Square=%8lg",S);
    return 0;
}
 

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