0_0_23772447_8509.cpp: In function 'int main()':
0_0_23772447_8509.cpp:19:7: error: 'M_PI' was not declared in this scope
out(M_PI * Sqr(r1));
^
0_0_23772447_8509.cpp:10:29: note: in definition of macro 'out'
#define out(x) std::cout << x << std::endl
^
0_0_23772447_8509.cpp:25:59: error: 'M_PI' was not declared in this scope
out(Alp * r1 * r1 + Bet * r2 * r2 - r1 * r2 * std::sin(M_PI - Alp - Bet));
^
0_0_23772447_8509.cpp:10:29: note: in definition of macro 'out'
#define out(x) std::cout << x << std::endl
^
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