0_0_11638834_7026.cpp: In function `double dangle(std::pair<double, double>, std::pair<double, double>, double)':
0_0_11638834_7026.cpp:36: error: `M_PI' undeclared (first use this function)
0_0_11638834_7026.cpp:36: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_11638834_7026.cpp: In function `void test(double)':
0_0_11638834_7026.cpp:48: error: `M_PI' undeclared (first use this function)
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