文件名称:1403
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给出三维空间上的三个点，计算以这三个点为顶点的三角形的面积。 输入的第一行包含一个整数T (T > 0)，表示一共有T组测试数据。
每组数据占三行，每行各描述了一个点的坐标。点的坐标会以x y z的形式给出，表示这个点的坐标为(x, y, z)，其中x, y, z均为[-100, 100]范围内的浮点数。
对于每组测试数据，输出三角形的面积（和标准答案的误差不超过10-6即可）。
-Given three points on three-dimensional space, in order to calculate the three-point vertex of the triangle area. The first line of input contains an integer T (T> 0), T represents a total set of test data. Each set of data representing three rows, each row describes each coordinate of a point. Coordinates of the point will be given in the form xyz, represents coordinates of this point is (x, y, z), where x, y, z are floating point numbers in the range [-100, 100]. For each test, the output area of the triangle (and standard error of the answer can not exceed 10-6).
每组数据占三行，每行各描述了一个点的坐标。点的坐标会以x y z的形式给出，表示这个点的坐标为(x, y, z)，其中x, y, z均为[-100, 100]范围内的浮点数。
对于每组测试数据，输出三角形的面积（和标准答案的误差不超过10-6即可）。
-Given three points on three-dimensional space, in order to calculate the three-point vertex of the triangle area. The first line of input contains an integer T (T> 0), T represents a total set of test data. Each set of data representing three rows, each row describes each coordinate of a point. Coordinates of the point will be given in the form xyz, represents coordinates of this point is (x, y, z), where x, y, z are floating point numbers in the range [-100, 100]. For each test, the output area of the triangle (and standard error of the answer can not exceed 10-6).
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