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R_Ngoai_Tiep_Tam_Giac.cpp
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// R_Ngoai_Tiep_Tam_Giac.cpp #include <iostream> #include <math.h> using namespace std; int main() { int a,b,c; float r,s,p; cout<<"Nhap do dai 3 canh a,b,c: "; cin>>a>>b>>c; p = (a + b + c) / 2; s = sqrt(p * (p - a) * (p - b) * (p - c)); r = (a * b * c) / (4 * s); cout<<"Ban kinh duong tron ngoai tiep R = "<<r; return 0; }