View Compilation Error

0_0_15434440_2651.cpp: In function 'double PolyCiclrArea(Circle, Point*, int)':
0_0_15434440_2651.cpp:117:62: error: 'SegmentIntersectCircle' was not declared in this scope
         int cnt = SegmentIntersectCircle(p[i], p[i+1], C, sol);
                                                              ^