#include<stdio.h>
#include<conio.h>
#include<math.h>
 int main(){
     float x, y, z;
     printf("\n Nhap toa do diem A ");
     printf("\nnhap x  ");
      scanf("%f",&x);
     printf("\nnhap y  ");
     scanf("%f",&y);
     printf("\nnhap z  ");
      scanf("%f",&z);
           printf("\n Nhap toa do diem B ");
           printf("\nnhap x  ");
           scanf("%f",&x);
           printf("\nnhap y  ");
           scanf("%f",&y);
           printf("\n z  ");
           scanf("%f",&z);
                printf("\n Nhap toa do diem C ");
                printf("\nnhap x  ");
                 scanf("%f",&x);
                 printf("\nnhap y  ");
                 scanf("%f",&y);
                 printf("\nnhap z  ");
                 scanf("%f",&z);
                float AB, AC, BC;
              int KIEMTRATHANGHANG(){
                    if ((AB + AC == BC) || (AB + BC == AC) || (AC + BC == AB) && (AB>0) && (AC>0) && (BC>0))

                    {
                    printf("ba diem thang hang %f\n", A, B, C);
                    }
                    else{
                        printf("ba diem khong thang hang %f\n");
                    }
                }
                    return 0;

 }