把在每个三角形上的公式（12）、（13）分别代入（14）、（15）并且

把在每个三角形上的公式（12）、（13）分别代入（14）、（15）并且通过对变量 和 求导，最小化（14）和（15），可以得到两个线性方程组：

結果 (英文) 1:

Triangles in each formula (12), (13) into (14) and (15) and through the variables and derivative of a minimized (14) and (15), you can get two equations:

結果 (英文) 2:

The equation (12) on each triangle (13) are substituted into (14), (15) and by the derivation of the variables and minimize (14) and (15), two linear equations can be obtained:

結果 (英文) 3:

In each triangle on formula (12), (13) were substituted into (14), (15) and through the variables and derivation, the minimization of (14) and (15), you can get two linear equations: