/*ktra xem tam giac abc co fai lla tam giac vuong ko*/

#include<stdio.h>

#include<conio.h>

#include<math.h>

typedef struct /*struct(kieu cau truc),typedef :*/

{

float x;

float y;

}diem;

float kc(diem A,diem B)

{

float s;

s=sqrt(pow(A.x-B.x,2)+pow(A.y-B.y,2)); /*pow:ham luy thua.pow(x,y)=x^y*/

return s;

}

int main()

{

diem A,B,C;

float a,b,c;

printf("nhap toa do diem A: ");scanf("%f%f",&A.x,&A.y);

printf("nhap toa do diem B: ");scanf("%f%f",&B.x,&B.y);

printf("nhap toa do diem C: ");scanf("%f%f",&C.x,&C.y);

a=kc(B,C);

b=kc(A,C);

c=kc(A,B);

if(a+b<=c||a+c<=b||b+c<=a)

printf("ABC khong phai tam giac");

else

{

if(a*a+b*b-c*c<=0.001||a*a+c*c-b*b<=0.001||b*b+c*c-a*a<=0.001)

printf("ABC la tam giac vuong");

else

printf("ABC khong phai tam giac vuong");

}

getch();

return 0;

}