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View Compilation Error

0_0_6363229_26348.cpp: In member function `bool Poly::in(const Point&)':
0_0_6363229_26348.cpp:121: error: `M_PI' undeclared (first use this function)
0_0_6363229_26348.cpp:121: error: (Each undeclared identifier is reported only once for each function it appears in.)


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