| Regular Convex Polygon |
A regular convex polygon is a polygon where each side has the same length, and all interior angles are equal and less than 180 degrees. A square, for example, is a regular convex polygon. You are given three points which are vertices of a regular convex polygon R; can you determine the minimum number of vertices that R must have?
Each test case consists of three lines. Line i consists of two floating point values xi and yi (
-104
x1, y1104)
where (xi, yi) are the coordinates of a vertex of R.
The coordinates are given with a precision of 10-6, i.e., they differ from the exact coordinates by at most 10-6.
You may assume that for each test case the Euclidean distance between any two given points is at least 1, and R has at most 1000
vertices.
The input will finish with a line containing the word END.
For each test case, print one line with the minimum number of vertices that R must have.
-1385.736326 -146.954822 430.000292 -2041.361203 1162.736034 478.316025 0.000000 4147.000000 -4147.000000 0.000000 0.000000 -4147.000000 END
3 4