View Compilation Error

0_0_39537738_23692.cpp:10:17: error: 'acos' was not declared in this scope
   10 | const double pi=acos(-1);
      |                 ^~~~
0_0_39537738_23692.cpp: In function 'int main()':
0_0_39537738_23692.cpp:103:67: error: expected ';' before ')' token
  103 |             cout << dis[res[i][0]]+dis[res[i][1]]-2*dis[res[i][2]]) << endl;
      |                                                                   ^
      |                                                                   ;