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Tam_Giac_XY.cpp
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// Tam_Giac_XY.cpp #include <iostream> #include <math.h> using namespace std; int main() { int x1,y1,x2,y2,x3,y3; float a,b,c,s,p; cout<<"Nhap toa do A(x1, y1): "; cin>>x1>>y1; cout<<"Nhap toa do B(x2, y2): "; cin>>x2>>y2; cout<<"Nhap toa do C(x3, y3): "; cin>>x3>>y3; a = sqrt(pow(x2-x1,2)+pow(y2-y1,2)); //AB b = sqrt(pow(x3-x2,2)+pow(y3-y2,2)); //BC c = sqrt(pow(x3-x1,2)+pow(y3-y1,2)); //CA cout<<"Do dai AB = "<<a<<endl; cout<<"Do dai BC = "<<b<<endl; cout<<"Do dai CA = "<<c<<endl; cout<<"Chu vi tam giac ABC la: "<<a+b+c<<endl; p = (a + b + c) / 2; s = sqrt(p * (p - a) * (p - b) * (p - c)); cout<<"Dien tich tam giac ABC la: "<<s; return 0; }