Harry Potter and J.K.Rowling

In July 31st, last month, the author of the famous novel series J.K.Rowling celebrated her 46th birthday. Many friends gave their best wishes. They gathered together and shared one large beautiful cake.
Rowling had lots of friends, and she had a knife to cut the cake into many pieces. On the cake there was a cherry. After several cuts, the piece with the cherry was left for Rowling. Before she enjoyed it, she wondered how large this piece was, i.e., she wondered how much percentage of the cake the piece with the only cherry has.

First line has an integer T, indicating the number of test cases.
T test cases follow. The first line of each test case has one number r (1 <= r <= 10000) and one integer n (0 <= n <= 2000), indicating the radius of the cake and the number of knife cuts. n lines follow. The i-th line has four numbers, x1, y1, x2, y2. (x1, y1) and (x2, y2) are two points on the i-th cut. (-10000 <= x1, y1, x2, y2 <= 10000) The last line of each case has two number x, y, indicating the coordinate(x, y) of the cherry.

Technical Specification

1. R, x1, y2, x2, y2, x, y all have two digits below decimal points.
2. The center of the cake is always on the point (0, 0).
3. The cherry was always on the cake and would not be on the knife cuts.

For each test case, in one line output the case number and the percentage the piece with the cherry has of whole original cake, rounded to five fractional digits.

1
1.00 2
-1.00 0.00 1.00 0.00
0.00 -1.00 0.00 1.00
0.50 0.50

Case 1: 25.00000%

iXay@WHU

2011 Multi-University Training Contest 15 - Host by WHU