#include <iostream>
#include <math.h>

using namespace std;

int main()
{
    float a,b,c,s,p;  //Problema calculeaza perimetru si aria unui triunghi oarecare
    cout<<"a=";
    cin>>a;
    cout<<"b=";
    cin>>b;
    cout<<"c=";
    cin>>c;
    p=a+b+c;
    s=sqrt(p/2*(a+b)*(a+c)*(b+c));
    cout<<"Perimetru="<<p<<endl;
    cout<<"Aria="<<s;

    return 0;
}