#include <iostream>
#include <cmath>
using namespace std;
main()
{
float a,b,c,s,area;
cout<<"Enter the 3 sides of a Triangle.\n";
cin>>a>>b>>c;
s=(a+b+c)/2;
area= sqrt(s*(s-a)*(s-b)*(s-c));
cout<<"Area= "<<area<<endl;
}
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