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1374：The Circumference of the Circle

题目描述
To calculate the circumference of a circle seems to be an easy task - provided you know its diameter. But what if you don't?

You are given the cartesian coordinates of three non-collinear points in the plane.
Your job is to calculate the circumference of the unique circle that intersects all three points.
输入解释
The input file will contain one or more test cases. Each test case consists of one line containing six real numbers x1,y1, x2,y2,x3,y3, representing the coordinates of the three points. The diameter of the circle determined by the three points will never exceed a million. Input is terminated by end of file.
输出解释
For each test case, print one line containing one real number telling the circumference of the circle determined by the three points. The circumference is to be printed accurately rounded to two decimals. The value of pi is approximately 3.141592653589793.
输入样例 
0.0 -0.5 0.5 0.0 0.0 0.5
0.0 0.0 0.0 1.0 1.0 1.0
5.0 5.0 5.0 7.0 4.0 6.0
0.0 0.0 -1.0 7.0 7.0 7.0
50.0 50.0 50.0 70.0 40.0 60.0
0.0 0.0 10.0 0.0 20.0 1.0
0.0 -500000.0 500000.0 0.0 0.0 500000.0
输出样例 
3.14
4.44
6.28
31.42
62.83
632.24
3141592.65
来自杭电HDUOJ的附加信息
Recommend Eddy
该题目是Virtual Judge题目，来自 杭电HDUOJ
题目来源 University of Ulm Local Contest 1996
源链接： HDU-1374
最后修改于 2020-10-25T22:44:24+00:00 由爬虫自动更新
共提交 295 次
通过率 67.12%
时间上限 内存上限
2000/1000MS(Java/Others) 65536/32768K(Java/Others)