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#include <iostream>
#include <fstream>
#include <math.h>
#include <iomanip>
#include <cmath>
using namespace std;
float abo(int a, int b) {
	float L;
	return L = 4 * ((3.14 * a * b + pow((a + b), 2)) / a + b);

}
int main() 
{
	ifstream in("elips.txt");
	int a; in >> a;
	for (int i = 0; i < a; i++)
	{
		int a, b;
		float L;
		in >> a >> b;
		cout << abo(a,b) << endl;
	}
	
}