Question

Giúp em với ạ

Answer 1

#include <bits/stdc++.h>

using namespace std;

double xa,ya,xb,yb,xc,yc,ab,ac,bc,p,s;

int main()

{

cin>>xa>>ya>>xb>>yb>>xc>>yc;

ab=sqrt(pow(xa-xb,2)+pow(ya-yb,2));

ac=sqrt(pow(xa-xc,2)+pow(ya-yc,2));

bc=sqrt(pow(xb-xc,2)+pow(yb-yc,2));

p=(ab+bc+ac)/2;

s=sqrt(p*(p-ab)*(p-ac)*(p-bc));

cout<<fixed<<setprecision(2)<<s;

return 0;

}