Untitled

#include <iostream>
#include <string>
#include <math.h>
#include <fstream>
using namespace std;
float aaaa(int a, int b) {
    return 4 * ((3.14 * a * b + (a - b) * (a - b)) / (a + b));
};
int main()
{
    int n, a, b;
    float P;
    ifstream jija("input.txt");
    jija >> n;
    for (int i = 0; i < n; i++)
    {
        jija >> a >> b;
        P = aaaa(a, b);
        cout << P << endl;
    }
}