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View Compilation Error

0_0_36712186_30716.cpp: In function 'int main()':
0_0_36712186_30716.cpp:901:49: error: 'M_PI' was not declared in this scope
             <<100*(ans.areacircle(circle(o,r))/(M_PI*r*r))<<"%\n";
                                                 ^


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