题号：NC237192
时间限制：C/C++/Rust/Pascal 1秒，其他语言2秒
空间限制：C/C++/Rust/Pascal 256 M，其他语言512 M
64bit IO Format: %lld
时间限制：C/C++/Rust/Pascal 1秒，其他语言2秒
空间限制：C/C++/Rust/Pascal 256 M，其他语言512 M
64bit IO Format: %lld
题目描述
PaiGuDragon is playing in a football match and is ready to take a free kick.
The goal range is the line segment from point)
to point )
The position of the free kick of the PaiGuDragon is)
.
It is guaranteed that
are positive integers.
Take football as a particle, then the angle between
and 
is goal angle.
Now, the opponent of PaiGuDragon plans to stand in a line segment
as a human wall.
Fortunately, PaiGuDragon can't kick elevator-ball and banana-ball. It can only kick along the direction of a certain ray and can't bypass the human wall.
Please minimize the goal angle that PaiGuDragon can get.
The goal range is the line segment from point
The position of the free kick of the PaiGuDragon is
It is guaranteed that
Take football as a particle, then the angle between
Now, the opponent of PaiGuDragon plans to stand in a line segment
The length of the human wall is %2C)
and the distance from 
to the straight line must be greater than or equal to )
The line segment is not necessarily parallel to the x-axis but it's required that 
must be above the x-axis.
Please minimize the goal angle that PaiGuDragon can get.
输入描述:
The input consists of multiple test cases. The first line contains a single integer--- the number of test cases. Description of the test cases follows.
Each test case contains 5 integers -)
输出描述:
keep 4 decimal places and output the angle of the smallest goal in the form of angle system.