package main

import (
	"fmt"
	"math"
)

func solve() {
	for i := 0; i < 6; i++ {
		var x, y float64
		fmt.Scan(&x, &y)
		atan := math.Atan2(y+float64(1e-12), x)
		if float64(0) <= atan && atan <= float64(50.0/360.0*math.Pi*2) {
			fmt.Printf("%.8f\n", atan/(2*math.Pi)*360)
		}
	}
}

func main() {
	var t int
	fmt.Scan(&t)
	for i := 0; i < t; i++ {
		solve()
	}
}