0_0_7503282_10573.cpp: In function `double new_angle(double)':
0_0_7503282_10573.cpp:518: error: `M_PI' undeclared (first use this function)
0_0_7503282_10573.cpp:518: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_7503282_10573.cpp: In function `double angle(const circle&, const point&)':
0_0_7503282_10573.cpp:523: error: `M_PI' undeclared (first use this function)
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