URI -1043 with C++

#include<iostream>
using namespace std;

int main()
{
    float a,b,c,area,pre;
    cin>>a>>b>>c;
    cout.precision(1);
    if((a+b)>c && (c+a)>b && (b+c)>a)
    {
        pre = a+b+c;
        cout<<fixed<<"Perimetro = "<<pre<<endl;
    }
    else
    {
        area = ((a+b)/2)*c;
        cout<<fixed<<"Area = "<<area<<endl;
    }

}