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The polygonal approximation problem is a primary problem in computer graphics, patt recognition, CAD/CAM, etc. In R2, the cone intersection method (CIM)is one of the most efficient algorithms for approximating polygonal curves. With CIM Eu and Toussaint, by imposing an additional constraint and changing the given error criteria, resolve the three-dinensional weighted minimum number polygonal approximation problem with the parallel-strip error criterion (PS-WMN) under L2 norm. In this paper, without any additional constraint and change of the error criteria, a CIM solution to the same problem with the line segment error criterion (LS-WMN) is presented, which is more frequently encountered than the PS-WMN is. Its time complexity is O(n3), and the space complexity is O(n2). An approximation algorithm is also presented, which takes O(n2) time and O(n) space. Results of some examples are given to illustrate the efficiency of these algorithms.